Hi I started out making cider, then beer, then mead and got REALLY into making beer to the point where it is now my job. Alongside that I made some wine, mostly kit, the occasional country/vegetable wine and the occasional wildcard brew, like squash, random juice, dried fruit, home solaria sherry, garlic wine, stuff like that.
After a long hiatus with wine I bought a 5gal kenridge kit and it'll be ready to bottle this week. It is REALLY good in comparison to my scattered memory of previous cheaper wine kits. I can tell that the quality concentrate really made a difference, it was 10L made up to 23L so for each litre of concentrate I needed to add 1.3L of water which suggests not a lot of concentration in making it. Cheaper kits require sugar, contain less concentrate so are either more sugar and water or use a concentrate that has been reduced down to nothing. That and the oak supplied and stuff seems to be part of it. I found it relatively expensive having made wine for pennies before, but it works out at £1.50 a bottle and tastes very good so far, very full bodied.
I'm going to have a go at some cheaper wine with bulk concentrate, grape powder, sugar, grape juice, oak chips, tannin and acid blend. This is obviously more of a gamble, the recipe isn't already done for me so it could easily come out awful, but I think I can get it down to 90p a bottle, without all the extra fluff it'd be as cheap as 60p.