I know this is an odd deal - but for parents with kids at secondary school - it's a good heads up (well I think so) :-)
Just been into my local tescos (whitstable) and they have a whole load of tools/ diy stuff at £1 (at the end of one of the aisles). As eldest daughter is going to secondary school in September - saw some safety glasses for science for a pound and grabbed them - otherwise I'll be hunting around in the summer cursing at the cost!!!
BTW They are made by Rolson and are adjustable :-)