[Wavgbtif]

If you can find a Waitrose get a Chapel Down Bacchus, I would taste it alongside a decent NZ Sauvignon Blanc and a Sancerre/Pouilly Fumé.

http://www.waitrose.com/shop/Product...l+Down+Bacchus

Most towns have an Marks and Spencers too... they have a couple of English Sparkling's which are worth a try.

Smaller independent off-licences are more hit and miss... but should have something English. Most vineyards are tiny and sell direct from their vineyard, and with those you'll find most are bad so it's risky.

Oh and the classifications are very loose but English Quality Wine > English Regional Wine > English Table Wine... I wouldn't bother with anything that isn't at least labeled English Regional Wine.

Specifications for the levels here:

http://www.englishwineproducers.com/qwrws.htm