The Consumer Contracts Regulations give you a cancellation period that starts the moment you place your order and ends 14 days from the day you receive your goods. 

You then have a further 14 days from the date you notify the retailer that you'd like to cancel your order to return the goods. 

Personalised, custom, bespoke or made to order items are excluded from this legislation. 

Your 30 day right to reject: You have the legal right to a refund if you return your faulty item within 30 days of receiving it, regardless of what the store's return policy says. 

Your return rights after 30 days: If you don't reject the goods within the first 30 days, and find a fault within the first six months of possessing your faulty goods, you'll need to give the retailer a chance to make a repair or replacement. If that's unsuccessful, you can then ask for a refund.

After six months: After the first six months, the burden of proof switches to you to prove the fault you've found was present at the time you purchased the goods in store or first took ownership of it if you bought it online. 

Items that can't be returned: Made to order - if an item has been made to order or personalised.