Alternative Vote is a single member constituency version of STV, that is therefore not proportional in any way.

It is perhaps the only form of democracy that's typically less proportional than FPTP.

I support electoral reform wholeheartedly and I voted for AV only reluctantly.

It does cover multiple schemes, but not the one the UK voted to not introduce.

http://www.electoral-reform.org.uk/alternative-vote

"AV is not proportional representation and in certain electoral conditions, such as landslides, can produce a more disproportional result than First Past the Post (FPTP)"