Cockney,
It might be a good idea to get yourself a comp gauge. If you've got one, ignore this next two paragraphs.
If you've not seen one, most are a rectangular piece of metal, about 2 inch by 1.5 inch and about 3 mm thick. There is a slot in each side; one for hooks and the other for the overall length of the fly. If the hook will fit in the smaller gap then its ok. I always used to wet my flies before measuring them because they seem to stretch a bit when wet.
I am not sure where you can buy a gauge. Most of the ones used by people from where I live (near Derby) are made from aircraft grade aluminium by lads on the night shift at Rolls Royce.
Once you've got a gauge you can go to a course fishing shop and look at the carp hooks. These are usually made from much thicker gauge metal than buzzer hooks made for fly anglers. They will sink much faster without adding any weight. So long as they fit within the gauge you can tie heavy buzzers that sink fast and are legal for comps.
Cheers,
Dovebob
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