Traqauir House is another ale that is supposed to be one of the best examples. It is hard to find in my area and I have yet to try it.
Traquair House Ale is the best beer I have ever tasted. I used to be in love with Fuller's London Porter, but once THA hit my lips, she became my mistress. I'm still married to the porter and she doesn't mind my filandering because I always come back to her, as my concubine is not cheap. Our local beer warehouse in Baltimore has it for $7.50/bottle (and a 10 oz one at that) and it can go anywhere from $10-$15 a bottle in a bar if you can find one that sells it (the Brickskeller in DC comes to mind).

As you said, it is the example of a Wee Heavy.