Might depend on the clinic and where you are, but ours for full IVF/ICSI was £2,500 for the basic treatment (consultations, scans), plus £750 for the ICSI (got a refund!), plus the drugs, which were anything from £600-£1200. If you're fully functioning, as it were, and not overweight, then the drug cost should be at the low end. Mine was £1100 (and I ended up not using about £200 of the drugs, which made me a bit 'grrrr' because I couldn't sell them back, or even donate them to someone who was struggling with the cost - and it would have been almost an entire course of one of the drugs for someone who wasn't as non-functioning as I was.
It will also depend on whether you do the long protocol or the short one.
If a cycle is cancelled, then I think it was £650, but I know that if we'd gone through a different clinic, this would have been over £1k.
Thinking about it, if your OH is able to provide a couple of wrigglers, even if it's through collecting by syringe (ouch!), you might be able to do a natural cycle one....
My suggestion is you have a good look at some of the IVF versions of MN - fertilityfriends, or some such - but make sure you get a UK one - US treatment is different, and have a good look at their experiences and guidance.
Oh, and even if the NHS won't pay, they will probably be prepared to treat you - just charge you - as they did us. This could be an option if you have a very good NHS facility near you.