Gluten provides 'elasticity' to baked products. Simply replacing an ingredient containing gluten with one that doesn't will result in a sponge that has a different (and probably inferior) texture to what you normally achieve. You need to adjust the other ingredients accordingly, so you should seek out a proper 'gluten free' recipe. This one has excellent reviews:
cake.aspx" title="Link to allrecipes.co.uk provided by user" target="_blank" rel="nofollow">http://
allreci
pes.co.
uk/reci
pe/2276
8/wheat
-gluten
-free-v
ictoria
-sponge
-
cake.a
spx
or, for ease of finding the ingredients, you could try Tesco's one:
cake.html" title="Link to realfood.tesco.com provided by user" target="_blank" rel="nofollow">http://
realfoo
d.tesco
.com/re
cipes/g
luten-f
ree-vic
toria-s
ponge-c
ake.htm
l