Tigger:
however they are performing a handful of flights, which seem to be at full capacity, if not closer... which proves the demand is there.
Not exactly, it proves the demand is there for the 12th fortnight period. You will note that there are no 'through' flights this year, only dedicated BFS passenger flights. That is because of the Border Force requirement to have transiting pax get off at the first point of entry and go through immigration complete with their belongings then reboard the same aircraft to go onwards to MAN, LGW, GLA or wherever. That had not been the case previously and so the longhaul season could be extended by combining pax from other UK airportsthrough BFS.
It is nice to see full aircraft but obviously the demand isn't there for a longer term or TCX would be providing a longer service period.