I've just had a quick glance before going out and I just wanted to check
back...

True the store would be downstairs and the boiler upstairs... all very
upside down. However the cold tanks would be in the loft, the small F&E tank
could be raised if necessary. The store is not a combination and no
radiators will be in the loft.

Is it still the case I need a pressurised system or wouldn't 100%
integrated/vented be OK?.

Thanks again,

DIYSOS