These restrictions have
nothing to do with ATC, and only serve to make things more difficult for the team at EGTE.
As I understand it some Desk bound Jobsworth has done some sort of Safety Survey / Risk Assessment for the approaches at the Airport. Apparently there is a building in the undershoot for RWY 08, which theorectically
could be hit by a single engine aeroplane with power failure once in a blue moon (on a Thursday, when there's a letter R in the month). Hence the need for a VERY displaced threshold....
As for departures off RWY26...
Following the same logic most airfields in the UK would be unusable by single engined aeroplanes. Indeed just "down the road" at Plymouth, the airport is
completely surrounded by housing
Rgds BEX