torby:
or just buy 1 bottle at Lidl for £2.99....and put a stopper in the neck
All very well, but if you don't drink frequently it'll end up going down the sink. A stopper will only prolong the life of wine by a few days at best (unless you're happy to drink it when it's oxydized). Even the best stoppers, i.e. the ones that actually insert gas into the bottle and totally seal it, can't keep a wine in good form for more than a week.
As I say, my comment is totally redundant if you don't mind drinking it when it's past its best.