Wine is dirt cheap and there are even some wined that are possible to drink - Lussac St. Emillion for example. Champagne is cheaper than in Poland even in absolute values.
I take it you haven't been to Ireland. Wine is very expensive here, except for Aldi and Lidl. A few weeks I got the chance to compare: a decent Chablis costs in Holland about 7 Euros; in Ireland a lesser Chablis costs 15 to 16 Euros. Chardonnay the same and try to find a Riesling...The range of wines is, like a lot of things, very limited, unfortunately.
Lager is rather tasteless
Some of them are, others aren't. Depends on what you choose. Ales are good, but not that great though.
It's not possible to buy Jacob's coffee
But why would you buy German coffee in the first place? (Dutchman speaking) You should get Douwe Egberts for your daily use of coffee. Much better quality anyway. If you go to Lidl and you buy that Goldbrand poundpack for 2 Euros and 69 cents, you'll have Jacob's Kaffee, only with a different package. Don't know if they have a Lidl in London and how much that would be in pounds though.
M-G (thinks Ksysia should come to Dublin, just for laughs)