most of the threads below give indications.
the german army is probably the most powerful by shere weight of armour, artillery and infantry, but because it is much less mobile than the french or british army it has less impact. the luftwaffe is pretty powerful as a close air support/interdiction/SEAD/reece airforce, though its air defence force is built around the ageing F-4F Phantom - though it is equiped with AIM120 AMRAAM missiles making it a good long-range BVR interceptor.
the french and british airforces are roughly equal, the french being more prevailant in air-defence and the british angled more towards interdiction, close air support, reece and SEAD
the french navy is bigger than the RN, but the RN has much greater amphibious and littoral capability while the french have a more 'blue-water' stand alone capability.
france and the UK have similar sized nuclear capabilities in terms of number of warheads, but the UK's are all based on trident submarines whereas france's are spread through submarines and aircraft - they certainly used to have land-based surface to surface nukes, but i'm not sure what the position is now.
the military capabilities of the three nations compliment each other, if they were integrated into single force - or under a single command for a specific mission - they would be immensely powerful.