Thanks for the offer - there's no need, I'm in the big city (well ok, Belfast..big-ish) for the weekend and there's a Maplin within walking distance - I could just buy a handful of them all against the time we do actually find a correct value.
To muddy the waters, I found
NRGDynamics chokes stating specs of 3.3uH, 900mA max current and 0.29ohms resistance. That matches most closely with the Maplin part of 4.7uH, 820mA and 0.34ohms resistance. I note the 10uH unit can only cope with 680mA, while the 2.2uH unit can handle a full Amp.