Andy,
As JCJC says, the alternators can pack in and cause a current drain - its not just them not charging the battery properly - typcially the diodes go and its cheaper to buy a recon alternator than pay the labour to replace the diodes.
How long does it take for the battery to go dead - i.e. the car wont start? If it is overnight, it may just be worth disconnecting the alternator one night and see if it makes a difference - there is normally a plug on the back of them that you can remove. Dont forget the puma is the same as a fiesta - running gear wise, so there are hundreds in scrappys so a replacement alternator will be a cheap fix if you can be confident that is the problem. Other issues can be the radiator fans where the relays go and they stay on long after you have walked in the house - and they stay for 2 hours till the battery is flat!
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