Well, after driving mine a good 75+ miles since the "recall", my butt-dyno can't report any difference, still pulls how it did before, and whilst I can't guarantee that I was driving in exactly the same manner (it won't be vastly different, I tend to try and be as smooth as possible when I'm claiming the mileage back

), I'm getting the same MPG figures as I was pre-recall.
I'll keep an eye on it in the coming week as I'll be doing a good 700+ miles in the next 5 days, a good mix of urban, countryside and motorway, so should be able to get a better grasp of the overall economy.