Question Author
Thank you for the great answers! In order then...
vehelpfulguy - probably more than I'd like to try without an expert sitting here with me, but well worth knowing! :-)
ACtheTROLL - well I will be dipped...! Never occurred to me! Doh! Quite right for pointing it out, too! (Might give the Tesco idea a bit more thought...) :-)
terambulan - thank you, but as you'll probably have gathered, I'm now thinking "if it ain't broke, don't fix it"... :-)
Once again, thanks to you all for taking the time to answer.