The problem with cork for a long time is that they got complacent, and an increasing number of wines sealed with cork were tainted or 'corked'. Since then, more and more bottles of wine have been sealed with screwcaps or plastic corks. But it tends to be the lower- and mid-priced wines that have...
Supermarkets like to operate with similar-sized suppliers and the size enables them to get up to these shenanigans. Independents like to work with similar-sized producers, and they have a different business model. The deals you point to are a dreadful con as you say, but the 25% off the entire...
If you can go that high, Sainsbury's TTD Godello and Austrian Riesling (they might not have them at all their branches, so worth checking) are both lovely, would work well at a wedding, and work out at great value on that offer. They also have a great Priorat in the TTD range, but that's a bit...
Depends what sort of volume you're buying. The larger the quantity, the day-trip becomes a more viable option. Now isn't the best time for this, because of what's happened to the exchange rate. The other downside of France is that you won't be able to sample a fair few wines beforehand, and...
Agree about Portugal, Greece, sherry and Southern France. Haven't had one for years, but Madeiras can be great value too, and some of the greatest wines in the world.
I'm a wine snob, but Jacob's Creek make damn good wines. Blossom Hill and Echo Falls are just dreadful, cynical nonsense.
Aldi and Lidl have a fine selection.
FWIW, you'll get the best 'VFM' in the £7-15 price point. Because of fixed costs (duty, VAT, shipping, bottles, labels, stoppers, profit...