I have heard that, although MYL have slots at TFS for their MAN flights, they do not have anything to operate their LGW services. MYT also don't have anything suitable which they could swap!!!!
Thought it strange that MYL haven't really shouted about their new LGW services, but this would explain why.
On another point I have heard that someone else is about to launch another new London TFS service, looks like everyone is getting on the act now. I just hope it is from LHR as that would make it miles better for me! Saves travelling to South of London!