Orlando Carrington Extra Brut NV (very widely available, usually £8.99). Retasted recently among a batch of more expensive sparklers, this simple Aussie stood up well. Drinkable enough on its own, but better still as a base for Mimosas and Bellinis.
Green Point Brut, Domaine Chandon, 1993 (Redmonds, McCabes, Verlings, Oddbins, Cheers Malahide, Thomas's Foxrock, Vineyard Galway and other outlets, £14.99£16.99). For my money, this classy Australian stands head and shoulders above its rivals from both the New World and the old one at the same price. Subtle, lively and beautifully balanced.
Champagne Pierlot Fils Grande Reserve Brut NV (Bubble Brothers, 01 6725777, 021 552252 or 1800 BUBBLE/282253, £18 if you buy six bottles; next day delivery nationwide £8£10 extra). At last in Ireland - a champagne at well under £20 that tastes as if it costs well over that amount. It's also perfect for brunchtime - round and full, not at all astringent. See Bottle Of The Week.