Just come back from Tesco in Egham, Surrey and they are selling Calpol 100ml bottles for £1.50! Don't know if this is nationwide but that's a bargain. Long expiry date ( till 2012) so I bought 2 bottles ( can only buy 2 at a time because they have that rule in case someone feels like buying them to OD! -)
Edit: just checked tesco grocery website: it is nationwide!