You are pretty safe on a MX bike for most events but if you enter any of the british championship events (beacons, Diss etc..) then you will need FIM enduro tyres, lights, horn etc.... You will also find that there will be a few tight checks to sort the men out from the boys and then usually a mx test and a cross country test as well. Rode them for 20yrs, spent a lot of cash doing so. So now gonna spend a lot of cash on my escort LOL....

Check out enduronews website for events, also have a look at david knight to see how it should be done....