Don't worry, I don't believe they check up with operators unless there is obviously a discrepancy. I can't imagine them phoning private owners in other countries, but it is possible they do a rough check, perhaps based on hours recorded for maintenance.
Anyway, I've just had my Frozen ATPL issued and I have flown many different aircraft in several countries. It would be very time consuming to verify all my flights, and despite the CAA taking 4 weeks to issue my licence I doubt they did check. There were certainly no problems with my hours, just the odd bit of paperwork going astray in the system.
Incidentally many people ask if they should get their 300nm CPL cross country flight signed, but I didn't. If you feel you have to get that signed then why not all your other flights? The CAA form will ask for the date of the flight so they can locate it your logbooks and that's it. Mine was in Australia and they didn't mention it.
Why not ask them?
Also I think most people would agree that someone who falsifies logbook entries will be unlikely to be up to scratch and will get found out. Once they are uncovered they are sure to get clobbered by the CAA and lose all chance of flying again.