You can get £50 off a £100 spend on gondola.co.uk which sells single bottles and cases of wine. Prices are pretty good as is, with good discounts on popular brands of wine (we went for Wolf Blass Red Label). You can get single bottles as cheap as £3.99 (already half price) so mega bargain with 50% off. Use IP50 at the checkout. £5.99 delivery. May get 8% quidco - but may not count if using voucher codes.
Now delivery is slow but apparently it arrives in the end!