Thanks MandaC, I've already started looking at other hob options - from what you say my thin worktop could be a problem. Like you, I wanted gas but may well have to go for ceramic. Which model did you go for in the end?
Interesting that neither you nor your friend rate Neff that highly. I think I'll go for a cheaper brand since I'm not exactly Nigella or Delia!
Hopefully I'll find an amazingly good kitchen fitter who won't charge the earth and will make everything fit in no problem