Glass requires so much energy to make - or recycle - that it is
always more eco-friendly to use aluminium cans
Firstly, that depends on how you recycle things. Perhaps in the UK
they melt down their glass and make it anew, but in some other
countries such as Denmark they'll actually use the same bottle again
after cleaning it out.If you buy a soft drink in a class bottle in Denmark you'll get a container that looks like it's seen war.
Secondly, it's presuming that pounds sterling is the best way to measure sustainability, and that just because something costs more now it's less sustainable in the long run.
Which is just patently silly. We basically have infinite energy on this planet as long as the sun keeps shining, but we don't have infinite easily accessible aluminum.
In the future access to basic material resources is going to be a lot more important than whether someone expended a few extra joules back in 2010.