Just to complete this subject.
Having search wide and far, there is no such thing as English pale ale liquid malt extract.
I just got an email back from Jamil. He thinks that the Maris Otter LME from John Bull would work well. Williamsbrewing.com has Maris Otter extract as well which he thinks would work as well. (and its a little cheaper).
Well thank God this quest is over. Now I can R. DW. and HAHB! Brewing this weekend. Yea!
It is wrong to say there is no such thing. English Pale Ale extract is the generic name. It maybe called Muntons or John Bull or Maris Otter extract, but they're all English Pale Ale extracts. It should be pretty easy to find.