Hi Oscarguitar, thanks for the link I will take a look and "favourite" it
I don't know if my mechanic is "Verado certified" but I think so, they are authorised dealer and service centre, I also know they have been on the phone a few times to Mercury UK to discuss the optimal set-up (e.g. about the height and props).
The engines definitely used to be serviced by a Verado expert in Southampton by the previous owner, his last service done May 2013, I spoke to that mechanic myself about getting the engine logs so I am quite confident this is true. That would certainly imply that something as significant as a recall would have been attended to.
I don't actually know how many cylinders I have (I had thought it was 6 but had my doubts when looking at the old manuals)
In any case it is a simple question to the people working on it now so thank you too for the tip and I will ask them