It appears that both B&Q and Comet have stopped accepting the Kingfisher gift vouchers that bear the names of those two businesses and that of Woolworths. This is a result of Woolworths going into administration. Woolworths has also supposedly stopped accepting these Kingfisher vouchers, but I had no trouble using one there today (and was given change in cash). It is suggested in a press release that the vouchers are returned to 'the issuer' but it is not clear whether than means KGV or some third party who may have issued vouchers, e.g. under an employee incentive scheme. I believe that vouchers issued by B&Q and Comet (with just the one company name on them) are still accepted there.