Tesco are running a promotion on Champagne 2 for £25, including the Lanson Black label which is usually 23.99 per bottle.
Add the £13 off £90 spend voucher code (XX2R6L) to the order, and bring the cost down to £37 + delivery.
The £13 off voucher WILL work because you're basket will total £95.96 (4 * 23.99). The 2 for £25 offer will click in at time of delivery.
Don't forget 2% Quidco.
Oops. 3% Quidco.