I know they are not very environmentally friendly but the flip side is that you save hot water and time. The other week in my local Asda I could buy 4 foil trays for £1.49 in the home section but downstairs the same trays were £2.38 for 2 (just because they had a Christmas label and were next to the turkeys). I get the impression that Asda wants to offer the best prices but this feels like a scam in plain sight. Does anyone have an email for customer services?