Carpet (Surrey Heath GU15)

Had a leak in lean to and the carpet is beyond saving, I need a piece approx 250 cm 8ft 3in by 285 cm 9ft 6 ins would prefer a darker colour as the dog is in and out of the garden, but need carpet to help retain heat as I sit in there watching the birds as it helps with my anxiety, had just painted the walls a dark green, but anything will help, so if you are having yours replaced and is in reasonable condition I would really appreciate and can collect tia