doris, I have two suggestions for the turhn out like biscuits phenomenon. Are you using enough mixture for yout tin size? even a quarter inch bigger diameter than the recipe says will have an effect. The second possibility is that the use of some selfraising flour or baking powder might help, yes i know its supposed to work without, but I for one need all the help I can get. A third possibilty but a faint one is altitude. In America when I lived there recipes and packet cake mixes had adjustments for altitude on them... yes I know, unlikely in the UK but you never know. I find that the blessed Saint Delia's recipe never fails and Nigella has one for an amazing chocolate cake which also appears to be me proof. Lastly I have recently had fun and games with an oven with a faulty thermostat. A separate oven thermometer froma cookshop costs 5 to 10 quid and can tell you if you can trust your dial setting... if all else fails, chocolate refridgerator cake!!!