One week after the pedestrianisation of London's Oxford Street, transport officials say the response has been "phenomenal".

Almost 1km (0.62 miles) of the shopping destination has been pedestrianised between Orchard Street and Great Portland Street by the mayor's Oxford Street Development Corporation.

The changes have been welcomed by some shoppers, with some stores reporting increased footfall.

Supporters say issues such as continued cycle use are teething problems, while critics argue the scheme is flawed and has increased journey times.

Helen Cansick, head of investment planning at Transport for London (TfL), said this was "the first week of a very long programme of investment and transformation".

She added: "We're going to see 50 new trees by the spring, more benches and seating area and then over the course of time we will completely improve the place, level all the road surfaces and make sure it's a really beautiful space that people can enjoy."

The completed project is expected to cost £150m, which includes the cost of highway changes.

London's mayor, Sadiq Khan, described the launch of the pedestrianisation on the 26 October as a "momentous day for London" and said the changes marked the first phase of efforts to lift the street out of "decline".

However, concerns continue to be raised about cyclists continuing to use the street, with no visible enforcement when BBC London visited on Monday morning.

Tom Fyans, from the London Cycling Campaign, said: "It feels a bit quieter than a week on.

"I think cyclists are getting used to the idea that they can't cycle down this route and they'll be finding alternative routes.

"You're going to get a handful who are not going to follow the rules and we need to keep working on that.

"But given that there are thousands of cyclists coming through each day previously, I think we're going to see a few teething problems and eventually that will get better."

A TfL spokesperson previously said riders were "obliged to follow the rules".

"We are working with dockless hire companies and delivery companies to ensure this is made clear and will continue to monitor and review as required," they added.

TfL said that, alongside barriers and signage, it was working with e-bike hire companies to "enforce strict geo-fencing" in the pedestrianised zone.

The measure would cut or reduce power to dockless e-bikes entering the area and require riders to walk them.

Alongside concerns about cyclists, there have been reports of anti-social behaviour, with some incidents shared on social media.

BBC London also witnessed an ambulance being diverted around the pedestrianised section while responding to an emergency call on Monday morning.

Critics of the scheme have raised concerns about its wider impact on journeys through the West End, particularly for bus passengers and other road users.

Michael Bolt, of the Marylebone Association, said: "Bus users have lost a number of routes, which means they've already got an extra 5-10 minutes on interchanges.

"Now they're finding that the time it's taking to get through the area is increasing substantially."

The mayor took control of Oxford Street from Westminster Council and has said the plans will continue to be tested and refined.

The council has said that identifying safe alternative routes for cyclists remains challenging.

Westminster Council deputy leader Tim Barnes said: "At the moment, we just don't know where this level of bike traffic can sensibly go.

"It's not just about looking at where in any one stretch they should be, it's how you create continuous paths.

"The problem with taking Oxford Street out was that it was London's primary east-west route.

"Every journey time is going to be longer as a result of that. Buses are taking longer, taxis are taking longer, emergency vehicles are going to take longer to get where they need to be.

"Cyclists are just one of the many users who are going to lose out in terms of journey times and convenience."

The Mayor's Office said the scheme would continue to be reviewed and refined, with further major works not due to begin until spring.