There's currently 40% off rosé fizz at http://www.majestic.co.uk
and bubbly offers including Bollinger Grande Année 1999 with 33.3% off when you buy two bottles, the bronze medal winning Veuve Cliquot 1999 and gold medal winning Piper Heidsieck Brut NV on the same deal. If you've got spare cash or expensive taste, lock onto the target and splash down.
Thanks to Olly from the Richard and Judy Show for the tip.
Forgot to mention that there is a minimum order of 12 bottles if you are buying online, although delivery is free and quidco pay 8%. Or you can go in person.