Hard to say Vic

If it was an attractive walnut stock, then this would be an upgrade from the standard stock and so you could probably get a price of £80 - £100

However, a beech stock may still appeal to someone whose stock is tatty or cracked and they do not have the 4 or 5 hours of spare time that it would need to restore it, or perhaps do not have the skills. In which case then probably £50-£65 would seem a reasonable price to pay.

John