This article is from the Model Rockets FAQ, by Wolfram von Kiparski with numerous contributions by others.
As far as we can tell, there are no laws in the UK which *directly* govern
model rocketry in the UK. For the time being, with model rocketry only in
its infancy (10yrs or so) there is little need for unnecessary regulation
so long as model rocketeers follow 'commonsense guidelines'.