Comet don't make it easy to find their returns policy on the internet . It took me a while but I found this
Store Purchases
Brand new & still sealed in its box, bring it back with your receipt within 7 days of purchase and we’ll credit you with a gift card or offer you a full refund.
Sorry, we can’t accept any products that have been opened, or returned with missing parts: remote controls, instructions etc.
Damaged Goods, If you discover any signs of damage, please don’t use the product – just contact us immediately.
Online and Telephone Purchases
For goods purchased on line or via telephone you have 7 days from the date of delivery in which to return goods - as well as the above options.
Portable products must be returned to the local store to arrange a refund. If you need to arrange collection of a large product, please Click Here to email us with your details.
Pretty clear as regards a store purchase - but does this mean an online purchaser could return an item even if it were opened ? Currys state they definitely do this in line with Distance Selling Regs . I wouldn't expect Comet to honour a Currys policy but what does the reg state ? I've been looking and found it pretty confusing ,
If an online buyer can return an opened purchase I see a possible solution
Geoff