Larrabee, ksand24, mbmoffat and all those who posted comments on this thread, thanks to all your help our ILR was approved yesterday. We submitted on 30th Dec in the middle of the day and were offered super priority, had the biometrics on Sunday 14th and received a decision yesterday mid morning.
Although everything is perfectly legit, above board and we have nothing to hide, the advice on this forum for the ILR (and the FLR before that) has been spot on in ensuring we crossed the t's and dotted the i's in terms of making sure everything was covered and preparing for each application in advance. Without this advice there's a chance I would have tripped up somewhere and risked being caught out because I missed a date here or there or submitted docs for the wrong period etc.
We're just waiting for the BRP to come through and will be straight onto Citizenship. I'm off to mbmoffat's thread on that process now to ask a few questions and clarify a few things.
Thanks again all.