First I must have filled the bowl too high as it was completely raw in the middle after over an hour and a half! The bowl I'm using isn't even very big.
I tried it again, I put an upside-down flower nail in the bottom of the bowl and filled the mixture up to the tip of the nail. It has now been in the oven for over an hour on a low heat, the outside I can see is starting to get very dark brown, the inside is still raw so I keep scooping mixture out to help cook what's left in it and will refill it with some cupcakes or something after. It's like a massive well now, what's left inside of where I've scooped out is still really moist, I wouldn't say runny but it's certainly not 'spongy' all the outside sponge looks dry and overcooked. The centre doesn't seem to be cooking any more how ever long I leave it?!
I don't know what to do! It looks a mess!
Thanks so much for your answers.