There is no need to use a sledgehammer to crack a nut at all. There is nothing as far as I know stopping the Tiffys dropping 1000lb non exploding LGB's on targets in built up areas, as was done by the GR4's in Iraq back in 2003. Also, surely it wouldn't cost a packet for 17 and 41 Sqn to do a quick trial to clear release of the 540 from the Tiffy, in formation with a GR4, using the Tonka's weapon system to compute weapon release and do the lasing. Buccs and GR1's managed to do it in 1991 pretty quickly.