Sigg water bottle on sale in local store (Southsea). These were the screw top design not sports bottle top. This is a good price as cheapest I can find is £9.99 on ebay and £17 on Siggs website. These (imho) are the best water bottles available. Made of one piece aluminium with an inert lining, no nasty chemicals to leak into your drink.
Don't know if this nationwide but good if you are local.
Update: found these in another store plus the 0.6lt ones for £2.99, bargain!!