Hi,
I've got one of those five litre mini kegs, the contents of which was finished off a week or two back. When I asked whether they could re-use it, the person at the brewery told me that home-brewers like to use them so, if anyone wants it please drop me a message. Otherwise it sadly goes in the recycle bin :-(
I'm located very close to Shipstone Street tram stop.
Cheers.