The site that PG linked just went down right now for whatever reason, but here's a google cache:
http://webcache.googleusercontent.com/search?q=cache:TpxePg-hmE8J:www.consumeractiongroup.co.uk/forum/showthread.php%3F331715-8000GBP-retained-by-Bank-of-Scotland+&cd=1&hl=en&ct=clnk
Post #7 is where the name is mentioned.
blackarrow = yew = Willie Carson according to PG's research.

Wait... That's the name of the person who was replying to yew/blackarrow, not the identity of yew/blackarrow himself..
LOL. Carry on. Nothing left to see here.

I do wonder why blackarrow tried to delete that post he made on this forum referencing that site though..