Seems a bit strange to have a possible Universal Park in the UK being planned for a year and the only proof available is the NVUL name, which doesn't even confirm that it's called or have anything to do with London... I'm sorry but I'm super skeptical about any of this being remotely real...
I'm not saying it can't be true, but according to the info you've provided (or the lack of) and the certainty that this is definitely happening, similarly to
@tommyhawkins, just isn't enough to speculate that much. Is there any other type of information or proof that you can share?