Some snippets from the GD UK site:
\"There was some debate last year over base sizes in certain categories. We have therefore chosen to use the words \"appropriate sized gaming base\" in several descriptions. The intention here is to allow a little flexibility whilst keeping to the spirit of the competition. So, if you want to mount your Terminator on a 40mm base because it \"looks nicer\", you can still enter it in the Warhammer 40,000 single model category. Similarly if you prefer to base your fantasy model on a round base instead of a square one you will not be penalised. However, please note the judges reserve the right to move models that are not on appropriate bases into a category they deem more fitting.\"
\"The Young Bloods painting competition is open to any competitors aged 14 years or under. Your entry should consist of any single human-sized Citadel miniature either Warhammer, Warhammer 40,000, Mordheim, Necromunda, Blood Bowl or The Lord of The Rings, mounted on an appropriately sized gaming base. Models must be single foot figures – no mounted models or groups. This category includes Terminators but other models supplied with 40mm and larger bases should be entered in another category. The judges will be looking for well-painted and well-presented models. Paint schemes should demonstrate originality, imagination and consistency with the spirit of the game worlds.\"