I checked last night and the model I have can be in an unvented compartment as long as it has the right clearances, and mine does, which is great. Thanks all!
Wow thanks for the speedy responses.
There's definitely enough room for access for service / repair.
Unfortunately I dont have the manual as the boiler was there when I moved in about 8 years ago - have boiler but no manual.
So i've looked at the Potterton website and have seen some...
I have a small Potterton Supprima boiler in my kitchen.
I've just had my kitchen refitted, and a cupboard has been built to hide the boiler away. There are currently no holes or gaps in the cupboard.
Somebody has told me the cupboard should have some grills cut out of it, to allow for air...