According to an article from The Daily Mail, both BBC and ITV are no longer involved in The London Resort because of environmental concerns surrounding the project:
The London Resort’s statement to The Daily Mail regarding this news is the following:Yesterday BBC Studios, the commercial ventures arm of the corporation, confirmed it was no longer involved with the project.
A spokesman said: 'BBC Studios has no commercial agreement in place with London Resort and no current plans to enter into any agreement.
'We would only consider doing so should there be clear and decisive evidence that the project would have a net positive environmental impact.'
An ITV spokesman added: 'ITV's arrangement with the London Resort was that we were a potential licensor of one of our children's brands, which was Thunderbirds.
'We can confirm that ITV no longer has a commercial arrangement with London Resort as the agreement has now ended. This means that Thunderbirds will not be a part of the park.'
Source: https://www.dailymail.co.uk/news/article-10553653/Tiny-spider-just-1cm-long-leads-BBC-ITV-pulling-plans-London-Resort-theme-park.html'Nobody ever said major infrastructure projects were easy or quick. We look forward to delivering the first top tier theme park for the UK.'