On a vacation with a bunch of neighbors in mexico, one night we had a wee bit too much to drink and myself and one of the neighbor ladies started talking in British accents in a bar. I claimed that I had a perfect Upper Bristol accent. One of the other neighbors actually found a couple from Bristol and had them quiz me. I ended up talking to the couple for quite a while. The neighbor eventually came over to make sure NATO was still good.
In conclusion, if Daniel needs any help perfecting his accent have him contact me.
That's pretty much the extent of my Bristol knowledge.