I do not know what makes you think that some of the carriers are on the spot UK .Even if "the whole stuff is shifted 15° to the east",it's hard to believe that having a signal around 7 dB on some of the carriers, they would be on the island spot?The only valid argument, in my opinion, as, for example,10818 would be on the UK spot, is the fact that transponders of subband are mainly destined for customers in Great Britain.In fact that want Brits{BBC& BSkB} providers when they asked SES to reduce as much as possible the European spot in favor of the UK.It's about copyright and broadcasting tv.
I think it's too early to say which spot is for UK or European as long as I , in the east of Europe,have strong signal on the spot UK even if we are in testing period,or precisely for that reason?!
And there is one thing that still do not know precisely how it will resolve: what agreement Eutelsat and SES were about 500 Ghz,which belonging the French company until a final decision from international court of arbitraj.
There are many questions about the changes that will make Astra 2E when will be operational at 28.2 E which we do not know anything definite .Many of these questions are speculation , including , of course, mine