Used in Scandinavia, Germany and Austria, PID switching isn't supported by Sky UK receivers.
Indeed not, but in the early days of D-Sat it was proposed by the BBC as a technical solution to managing regional opt-outs. The killer wasn't really a technical perspective, but BSkyB's insistence on a huge indemnity from the BBC to allow for disruption to the stability of the platform. OK? Well no, not really OK. IMHO Sky got away with a monopolistic slight of hand.
But now, lots has changed.
(a) The Sky Platform is so mature, stability ought not to be an issue.
(b) When Sky substitute adverts (AdSmart) off local HDD, it is really seamless. Nobody actually notices.
(c) With the Competition Commission enquiry into the Fox takeover going on; OfCom could pretty well ask for anything.
(d) It's in Sky's interest to be really nice to the BBC, even if they actually hate them.
(e) You bet that the BBC would actually get away with ITV bailing them for half the cost of making it work with FreeSat too.
(f) By 2020, they have to have engineered this for DTT