OP
shagbite
in general, conservatories are exempt from building regulations, as long as they abide by certain criteria, e.g. they are built at ground level & have a total floor area of less than 30m2. it would be up to you and your builder to determine which category your project falls into.
as a guide, the building reg's don't allow block work chases of more than 1/3 of the thickness of the block for vertical chases, and 1/6 of the thickness of the block for horizontal chases.
as a guide, the building reg's don't allow block work chases of more than 1/3 of the thickness of the block for vertical chases, and 1/6 of the thickness of the block for horizontal chases.