I'm assuming that was around 6000 miles - not the initial 600 mile service? Still seems a worryingly low mileage for this problem to be developing. Have you been off road much or at all?
Interesting, glad you got sorted but i'd be worried when a franchise dealer keeps changing their story - not very re assuring, "at first said they hadn't heard about the recall and then said all parts were on back order" next "at first said they hadn't heard about the recall and then said all parts were on back order" they actually have the parts.
Mines done. Checked and bushes fitted. In a one'er at Cooper, Sunderland. If you're at all confused about what is the official line, ring local dealers. I rang 2 and got same story that it was official recall.
I believe they are no longer checking, just fitting, having mine done as there was some gravel and a dead rabbit on the A14 the other day which might have damaged them