I received my replacement sim pack in the post this morning - the credit I had remaining on my old sim hasn't been transferred as promised
The number range I've been given is 44 7937, according to ukphoneinfo this is Jersey Telecom -
http://www.ukphoneinfo.com/search/Ph...7_code_79.html
The sim pack had a Borehamwood post office stamp on it, which does match where the site claims it is based (Elstree).