Saw these in Home Bargains yesterday, few different sizes but LOTS of XXL so be quick if you want a pick of sizes. £3.99 for the Polo Shirt and £1.99 for the T Shirt in the same design. They are great quality and nice if you are an F1 fan.
I think they are from the 2008/2009 ish era before Singapore crashgate and the loss of ING sponsorship. The RRP was £39.99 for the polo shirt and £29.99 for the t shirt.