A year or two ago, I reported a colour-ringed med gull on Great Yarmouth beach and was slightly deflated to find it had only been ringed a couple of days earlier, on exactly the same beach.
Back in November, I saw a different colour-ringed bird. Finally got round to reporting it, and got a very different story (and an impressively quick response from the ringing project). It's been reported with great regularity, mostly from Yarmouth, but was first ringed in Antwerp ... in 2001. As an adult, at least 3cy. So it's at least 16 years old.
Visited Great Yarmouth on Thursday and saw exactly the same Med Gull that I'd seen this time last year. It'll be at least 17 now. It spends its summers in the Antwerp area and its winters in Yarmouth, pretty reliably, based on what I've heard from the ringing scheme.
Looks like it gets reported about once a fortnight while it's in the UK.