It will indeed, Martin, except that it doesn't take the blue flashing light from 3925; you would need two of 30 23 6300 from 3130 (which is a very nice set) or two of 30 04 5300 from the 3425 ambulance which is a more pleasing blue. However, you'd need to check of the latter were still available. Alternatively, you could buy a new roof from the 3925 set, you'd need 30 67 0440 (the roof itself) and maybe one of 30 21 7050 (rear blue light right-hand side looking from the rear) and one of 30 21 7060 (rear blue light left-hand side looking from the rear), although you should be able to clip these out of the old roof and into the new one.