Thanks for the advice guys. I've not come across built in ovens and hobs on an internal wall and I was concerned that there would be a weird and wonderful regulation somewhere about this.
The paintwork comment was based on my thinking that a fan oven draws air in and also vents hot air out...
We have a kitchen designed by a muppet on prozac, and would like to swap things round so the kitchen can be a proper one.
The built-in oven and hob are on an external wall, but the rest of the kitchen is on the other side of the room. If I move the oven it could only go along an internal...