You local Homebase store may stock loft panels, though not all stores do. The loft panels product that Homebase carry is a 3 pack of Loft Panels measuring 1220mm by 320mm and currently costs £8.99. This is an almost identical product that Wickes sell for over £2 less and will also deliver to your home
So if you are looking to buy online, Wickes have a special home delivery service for bulky items meaning you can now buy Loft Panels and other chipboard flooring online from Wickes. Buy Loft panels online at Wickes.
Homebase don’t sell any kind of sheet materials (including loft boards) online. The reason for this is the cost of delivery of these large goods is really high compared with the value of the goods.