Warning: honest truth below. Not trying to put you off and despite my experience, I'd still recommend it!
I had both done at the same time, though not in the UK, a few years ago, anterior approach. Surgeon assured me that recovery time for one or both hips is actually the same. So, I was walking unaided a couple of days after the surgery but I had reacted badly to the anaesthesia and pain meds, so my Lazarus moment was actually later than it should have been. I was home from hospital after five days, able to climb stairs with one crutch.
I didn't have toilet seat riser, or grabbers, or anything like that, just a cloth bag to carry my bits and bobs with me around the house!
I found the post-op pain quite hard, not least because I didn't tolerate any pain meds except paracetamol/ibuprofen. The worst part was the sleeping - or lack of it, and the sheer discomfort at night. I don't and cannot sleep on my back, but had to for 4 weeks. So I literally didn't sleep for anything more than an hour at a time for several weeks, and it was awful. I spent the nights with ice packs on both hips. As soon as I could sleep on my side again, it changed everything!
I had read accounts from others before the surgery saying that the hip pain would be gone instantaneously, etc, etc, but this wasn't my experience. It took more like 3 months to feel remotely able to do "normal" stuff - even sitting for more than 30 minutes wasn't possible for me, and it took 6 months to be able to kneel again. That said, I went on a foreign holiday with just my 2 kids 6 weeks post-op, drove around on holiday, swam, shopped, etc. So I could do stuff - but it was tough. I still can't do certain Pilates positions that I could easily do before the op and am much less flexible in my right hip.
I'm not saying this to put you off, as for me it was still worth it, life post-op is 1000 times better than it was. But just to show that everybody's experiences are different. I'm fit, healthy weight, no health issues, but had a relatively slow recovery and higher amount of post-op pain than others, even taking into account the double-whammy op that I had.