One week on from its launch as a 'greener, safer, world-class destination,' Sadiq Khan's pedestrian haven on Oxford Street is a lawless cyclist's rat run.

That is the view of shoppers, workers and even Transport for London (TfL) enforcement officers, who have been given the impossible job of halting speeding cyclists in order to hand them a £160 fine.

Bicycles, cars, buses and taxis were banned from half a mile of Britain's most famous shopping street on October 26, with plans to install benches and trees as part of a revitalisation project that will cost £150million.

Lord Khan - who is yet to say whether he will run for a fourth term as Mayor of London in 2028 - said last week the move would 'revitalise Oxford Street' as he tries to rid it of its tacky image and association with 'dross' American candy stores.

But those on two wheels are continuing to make a mockery of the Mayor of London's mission to clean up the street, while buses and taxis forced onto side streets are enduring agonising gridlock.

Shoppers, locals and campaigners are calling for an urgent rethink just one week in, fearing cyclists will continue to ignore signs telling them to dismount with impunity.

As if to prove the point, hundreds of people on bicycles swamped Oxford Street on Friday night at the behest of guerrilla cycling movement Critical Mass. 

TfL's own traffic cameras captured the swell of bicycles on a road where they are supposedly banned. Among them were dockless hire e-bikes from firms including Forest and Lime - despite their pledge to stop the bikes working on the street.

The event proved too alluring to resist for London's phone-snatchers, who used the gathering as a smoke-screen: at least one bystander was deprived of their phone as they filmed the passing peloton, according to witnesses.

Organisers said they were not challenged by enforcement officers - who have privately admitted that they are powerless in the face of someone who refuses to stop. 

Social media is rampant with videos of gangs of youths cycling along Oxford Street with seeming impunity, weaving between pedestrians who come to a dead stop for fear of being hit. 

A clip filmed last week showed cyclists passing through the bollards as an enforcement officer in a hi-vis jacket can only watch on. A witness can be heard chuckling: 'He's given up.'

One enforcement officer told the Standard that they had faced hostility from cyclists, with a group of teenagers pushing him as they doled out racial abuse; another said roughly seven in ten cyclists refused to comply with requests to dismount.

While the Metropolitan Police provided a highly visible presence on the first day, action on cyclists ultimately falls to Transport for London. 

The Met says it is providing 'visible patrols... regularly throughout the area' in support. Shoppers and residents, meanwhile, have called on TfL to step up its game.

Local resident Michael Bolt told the Standard: 'Pedestrians should not have to dodge cyclists or be intimidated into moving out of their way.

'Nor should enforcement officers be left powerless to deal with dangerous behaviour. But all of this should have been considered beforehand.

'Without constant vigilance, a properly funded management plan and effective, enforceable restrictions, the scheme risks becoming a free-for-all.'

One shopper, 55-year-old Damon, added: 'At the end of the day, if you want to control it, you'll have to fine people if they don't abide. I don’t want to see anything bad happen.'

While attempts at civil enforcement against anyone riding their own bikes - or TfL's own Santander Cycles - appear to be fruitless, cyclists using dockless e-bikes like should be blocked from riding them at full speed in Oxford Street.

Lime, Voi and Forest had pledged to 'geofence' the area so the electric motors on their bikes deactivate in the bike-free zone - but some are still making it through.

Lime previously said it was 'continuing to refine' its geofencing, while Voi has insisted that its 'no ride zones are working as intended'.

Professional hire firm Port, whose customers are largely delivery riders dropping off takeaways, is yet to say whether its vehicles are geo-fenced. Its customers pay £50 a week to hire a bike as they work shifts for the likes of Deliveroo and Just Eat.

The Daily Mail has contacted Lime, Voi, Forest and Port for comment. 

The Mayor of London had been warned well in advance that enforcing a ban on cycling would be all-but-impossible.

More than 600 people and groups who responded to TfL's consultation on the plans said they were concerned about cyclists ignoring the ban.

But transport bosses insisted that alternate routes, and the sheer number of pedestrians, would 'significant(ly)... deter cyclists from using Oxford Street'. 

That has not happened - and has come at a cost.

Disability campaigner Mik Scarlett said the anti-terror bollards installed to prevent cars from driving into the pedestrianised zone made navigating Oxford Street in his wheelchair difficult.

He branded the bollards 'inactive discrimination', telling the Telegraph: 'It’s almost like we don’t matter because it’s much more important that everyone remains safe. But we can’t get in there.'

And Bahrain 'Baha' Mujagata, thought to be London's youngest black cab driver, says the streets in the immediate vicinity of Oxford Street are now snarled up with traffic.

Mr Mujagata told the Local Democracy Reporting Service: 'There (is) so much traffic on Regent Street with nowhere else to go. Sitting through traffic that I used to bypass makes life much harder.

'Regent Street going northbound is very crowded, with a cycle lane on the left and a central reservation. If a bus picks up passengers, you have to stay behind it. If it’s like that at night, I can only imagine what it’s like during the day.'

The driver said he was not against the pedestrianisation of Oxford Street in principle, but that Lord Khan's effort was not the way forward.

Mr Mujagata added: 'We will evolve and get used to it, like whenever they change a road or turn. But drivers who knew how it was before will always remember.'

Susan Hall, leader of the City Hall Conservatives group in the London Assembly, accused the Mayor of 'pushing through' the Oxford Street plan with little regard for those who had warned of the consequences.

'I have said all along that my biggest concern is safety,' she told the Daily Mail.

'I went to Oxford Street the other day and around it is gridlock traffic, which is what we said would happen. 

'And while it is easy for able-bodied people to get around, those with disabilities who need to get a bus to where they're going (on Oxford Street) now can't.

'This has been pushed through by Sadiq Khan because, in my view, he won't stand again and wants a legacy to leave behind.

'I hope he doesn't leave the pride of our high streets crime-ridden by the time he leaves in the next 18 months.' 

The Mayor of London and Transport for London were contacted for comment.