Hi Tony. If you want a 1/72 bf-110 there is the Airfix offering, which basically has a hole where the cockpit is. I can't remember what the details are like, but It's probably Airfix like! It's also Out Of Production (OOP), but can be found with some looking. I believe it's also BoB era. The only other 1/72 BoB era 110 is the OOP Fujimi offering. It's not bad, but it really needs the Airwaves detailing set.
With later bf-110G series there is more choice (the 'antler' one). The Italieri one is really good, except the panel lines are raised. Why, oh why, oh why, do Italeri, even sometimes with recent aircraft, persist in this?! However, if you can live with this flaw, or want to rescribe (I think probably not too difficult with this aircraft), then it's not bad at all. There is also a High Planes kit. Never seen it, but knowing High Planes reputation, possibly not as good as the cheaper Italeri.
For the bf-210A there would seem to be offering from Bilek, Revell, and Italeri. As Bilek produce moulds for these Revell and Italeri, and, at least in part, are paid by producing their own kits from the moulds, I would guess that all 3 are offering the same kit. Maybe the Bilek bf-210B is an update?
For the
Hornisse (the bf-410), there is only Eduard, who supply it in 3 different flavours. As their offering is based on the Fine Molds offering, as Eduard have a fine reputation, and even by Eduard standards the price is high, I'm guessing it's a fine kit.
BTW, thanks very much for your offer of the Spitfire part. I might need it too! Do you by chance also have a spare rear canopy? My Tamiya one is broken, and my vac-form replacement doesn't fit well? If so, I'd really appreciate that too. Is there anything you'd like from England?