Can you use Marks and Spencer gift vouchers online?

pretty sure u cant

yes you can i have previously also mine from sky lol
oh yeah forgot to say i work for marks and spencer too

This following information is from the Marks & Spencer web site, so it looks as though you can't use it online (also my gift card does not state that it can be used online).:

Can I use gift cards/Loyalty vouchers?
If you have received loyalty vouchers containing an online promotion code, you can enter this for your online orders. Gift cards can only used for in store purchases.