Nigel, if a brand new battery died that quick, you've got another problem somewhere. Have you actually tested the battery?
Take a carefull look at the wiring, pull the heavy lead off the back of the starter and clean the lead and the bolt it fits on to.
Are you sure the battery is not being drained by a parasitic drain?
And to all you with glow plug problems, I say, FIT A FLAME PLUG!
