OP "It's started affecting his sciatic nerve now as a few times he's lost feeling in his legs and nearly collapsed. "
I don't wish to be alarmist - and I am not a doctor - but when I had some spinal problems, after discharge I was told to report to the doctor immediately if this occurred.
thing is, we don't know what is wrong with your DH and we can't assume. Honestly, if your doc won't see him tomorrow and you're in a position to pay, I would get a referral any way you can.
I am also concerned that A&E would simply give painkillers - though of course if he needs morphine etc he should go - but then afterwards they will simply refer you back to your GP.
Maybe my GP is just cautious, but asked me to report any loss of sensation to her immediately. She is a very good thorough doctor though, sadly it sounds like your whole practice is shite. Honestly, if you can get a private referral either through a private GP or that pushdoctor thing, I would.
and then I'd give your current doctor the push!!!!