As proved by the flickr evidence below, I’ve been at every one of the five Mashed Library UK events so far. Only one other mashee (and not even the Father of Mashed Libraries™ himself) has managed this frankly incredible feat: surely I deserve some kind of mashlib long-service medal?
Here I am at the inaugural Mashed Libraries UK 2008, wearing a black sweatshirt:

And at Mash Oop North, wearing a black short-sleeved shirt: quite racy.

Gesticulating, and possibly speaking, at Middlemash, wearing a black sweatshirt:

On the left at Liver and Mash. Black sweatshirt: check. Special mashlib beard: check.

Finally, last month’s Chips and Mash.
OK… here my story gets a little thin through lack of supporting evidence. Apparently I was behind a pillar (or walking the streets of Huddersfield with a pile of takeaway pizzas) for the whole day, and there’s no convincing photographic evidence I was there.
Possibly it’s all a ruse on the part of Professor Moriarty to discredit my claim, and claim the mashlib crown for himself. But I’ll swear I’m in the background of this photo, talking to @garygre and @chrisl1953.
If it adds any weight to my argument, I was wearing a black sweatshirt.

