I haven't done an english style beer yet but have been thinking about somethink like ESB for a while.
1st place to start is with the extract recipe here
Use the same hopping rates. Use a combination of sorghum syrup and rice malt. I'd also use half a pound of dark candy syrup and some lyle's golden syrup.
The malt flavour which is prominent in English beers will be a challenge. You'll probably want to read up on roasting oats and adding these to your beer. Please take note that 4 out of 5 Celiacs can tollerate oats which haven't been contaminated with Wheat. I recommend testing the oats by eating a small bowl's worth first to ensure you don't have a reaction.
Hope this gets you started.
My gluten free home brewing blog.
Drinking: Hopped Honey IPA
Fermenting: 2 Ciders with S-33 Yeast, Summer Pale Ale and a West Coast IPA
Planning: Belgian Triple, Blood Orange Wit and American IPA
All gluten free.