Thanks for this.
Have just checked ds' and they too run out in Jan 2010, which means his school ones also run out then as I got them all together and remember thinking that the 'use by date' was the same on them all.
MetalMummy, the new batch are obviously available now then. I'm sure these latest ones lasted longer though.
I shall have to dig out the repeat prescription for them. I'm sure I've lost it put it somewhere safe.