What wheelset is that? Corima?🤩😍
If anything the price on 650c wheels is going up (slightly), just because good brands are now so hard to come by...
Although what is that a track rear hub?🤔
I personally don't think you will get £500ish.😕
It really depends on how much you want to keep it or sell it.
You yourself said "wanting to sell".
That usually means offering a low enough price that someone [eventually] takes you up on your offer.
1x magura brake caliper front / rear MT4 MT2 MT3 MT5 MT6 MT7 MT30 MT8 sport (only used for two test rides) AUD$80
https://www.ebay.com.au/itm/116055824838