Thanks for the instant response, Mal. It's only just struck me that it could be a problem. I leave next Friday. If all goes to plan, I have would have enough time between SQ early am arrival at T2 and departure for France on BA from T3 (separate PNRs), to go through arrivals as if I had checked luggage to collect, get the SIM landside, go to T3 and through security all over again. It's a bore, but do-able. Which terminal is my best bet for finding a shop rather than just a machine? The last time I used a mobile phone while away, I bought it from a shop in a town in the UK, and was very glad of their help in setting it up to connect to the network, as it didn't happen as automatically as it should have. As a mobile novice, I could well need similar help again.