Our main shipper is Royal Mail. Delivery details and tracking:
https://www.royalmail.com
To United Kingdom (except Isle of Man, Isle of Wight & the Channel Islands):

Royal Mail Standard delivery Track 48 to door service
(£4.00)
usually 3-4 days (limited service with parcel weight under 2kg only)

Royal Mail Standard delivery Track 48 to door service
(£6.50)
usually 3-4 days (above 2kg up to 10 kg)

Free Delivery via Royal Mail Standard delivery Track 48 to door service
Free
Order above £39.90
usually 2-4 days with tracking (Cats 1st UK has the final decision of courier service provided)
Customs and Duties
We are not responsible for any VAT, tariffs, duty, taxes, handling fees, brokerage charges, customs clearance charges, etc. required by your country for importing consumer goods.

Free delivery for purchases of £39.90 or more.
Orders usually arrive within the times stated, but delivery time is not guaranteed. Saturday isn’t counted as a proper working day, however your order may arrive on a Saturday.
If you’re out when your order arrives, the delivery person will either leave it on your doorstep, or post a slip giving you instructions to postmen on how to re-arrange delivery.
If your order hasn’t arrived in the expected time, please keep on tracking via Royal Mail website, or wait a couple of days to account for delays. You may contact us for details on what to do next.