Mark_K wrote:
I am tempted to go do 60 on the stretch in question just to stick one up the local camera partnership.

Well the ironically named Humberside Safety Camera partnership are likely to be there waiting to zap you, given their favourite roads for enforcement appear to be busy, main roads that used to be NSL (and safe to do 60) and now have been reduced to either 30 or 40mph zones.
The rules for mobile camera enforcement, which incidently is their favourite, require 2 ksi within the last 4 years, this is much less stringent than the requirements for siting a permenant speed camera. They basically allow partnerships to plonk their tallivans on almost any busy main road and to reap the financial rewards for doing so, most extremely busy roads (such as the one between hull and york for instance) will easily meet this criteria due to the sheer traffic volume, not because they are in any way more dangerous than an 'average' road.