Thorpe's limit is 500ft, so long no plane routes are blocked. Whilst I doubt we will see anything this high they can certainly build above 205ft.
In regards to tthe above plans - I suggest you forget these at this point as I guarantee they have been shelved. Thorpe's long term development plan has no ended and so those plans are now irrelevant until we find out about their next LTDP, due this year.