OK back home now.
Premium Passport Control worked just as well as on the outbound. But the other queues were not that long. But for £7 it reduced stress levels considerably to get through without a delay.
Gatwick Connects was a pleasant surprise. Took our bags to their counter in the baggage hall and were assisted by a lovely lady who helped us with the self-service baggage machine. However, due to customs rules, she couldn't take the bags immediately we had to take them ourselves to the exit doors. Just inside she took the bags there and loaded it onto a scanning machine and (I assume) it went into T1 baggage System. Connection was to EZY and the bags arrived in GVA as expected. What a relief not to schlep our bags through the terminal to the easy bag drop.
Premium Security was again quite efficient, but without long queues at other security it's difficult to say if it was worth it or not.
Flight was from gate 110 so was called almost 50 minutes before scheduled departure. We had 30 minutes in the shops, just enough for Mrs ExXB to get a couple of things. Flew on U2's first OE registered aircraft.