I am aware that it doesnt help get the kit into the shops, but it certainly means that if it was to become available in any shops, the details could be passed onto parents during the summer months.
In the meantime, the kit is available to purchase from the suppliers website
Surridge Sport
note only shirt, shorts and socks are needed to be purchased, any others are optional extras.
As for the letter regarding parents coming into school to purchase the kit, i understand that this was purely done to enable the child to try on the kit for fitting purposes as the kit is made to order by Surridge.