It depends on how you define 'affordable' and what your expectations on sound quality are.
I think cost wise, you are probably looking at least at £200 for wireless headset that comes with a stand; even then, there are more expensive wireless headsets that don't have a charging stand. Cheaper wireless headsets tend to be plug in USB cable to recharge.
Whether you get good sound for the money paid though, really depends on your expectations. There are people that have the opinion that any wireless headset below a certain price point is just plain rubbish, but there are people that are happy with wireless headsets from Steelseries, etc. No wireless headset can match wired for sound quality pound for pound though; convenience comes at the sacrifice of some sound quality. For some people that's fine, for others, sound quality is more important.
I've seen people spend £300 on a wireless Steelseries headset and be happy, and I've seen other people return them because they are just not good enough for what they cost. Same applies to Astro headsets.
Audeze Mobius is widely considered to be a very good wireless headset, but not really affordable at around £350. I don't think they come with a stand either. That shows what you have to pay for most people would call 'a good wireless headset'.
If you just want headphones and don't need a microphone, then Sennheiser make some good wireless headphones, as mentioned above; otherwise, you're mainly stuck with the usual PC manufacturers, such as Steelseries, Logitech, Razer, etc.