no1newts, that's annoying, was it a FW or GW kit?
Either way if you give GW a ring they may be able to send you the correct sprue* otherwise you may have to go to a GW store
I've been playing around with some tau, dug out my Riptide and finalised sub assembly, although I'm going to have to wait from new magnets so I can try to magnetise the big gun on it (it looks like I need a 4mm magnet, I've got 1,2,3,5,6,8 and 10 in stock).
I also had a look through my "part assembled" and stored boxes and found I've got a couple of Crisis suits I'd forgotten about (in addition to the 6 or 8 i've got part painted), 20 FW's that i'd completely forgotten about, about 9 Stealth Suits, and a Broadside to assemble and paint.
I spent some time assembling the new FW/Breacher team kit (as breachers), and was impressed by how good it was compared to the old FW kits from before they did the dual kit, so many options and parts, especially as it had the lower half of 2x Sheild, Gun and Markerlight drones as well as the Guardian drone and turret drone
I've got loads of gun drones so the fact it only has the two tops isn't going to be an issue, as I have no intention of making more standard gun drones for a long time but do want more of the specialist ones
*One of my friends got the big Titanicus set and one part was missing from the token and measure sprue, GW sent him the complete rules box as that had the sprue in it (this is a guy who somehow got a free sub to White Dwarf for years).