Or Aldi Monsigny Champagne at £9.99 without an imaginary price reduction.

Save yourselves the hassle and spend the same amount or less on prosecco. Tesco finest prosecco £8 a bottle beats any sub £30 champers. Lovely stuff

Vinegar

Get what you pay for , splash out get a decent bottle of bubbly instead

Your comment bores me, is that ok with yourself ?

I've got a spreadsheet of ALL supermarket champagnes here. Shows an easy to compare list.

Because at £20 it's not competitive with other Champagnes. Morrisons currently have their own label at £15 and Piper-Heidsieck, a major brand at £20. Many supermarkets have - or have had Lanson at £20

The regulations on price reductions require products to have been on sale at the higher price (usually for at least 28 consecutive days). I expect this is what you saw

Indeed, that's exactly my point. All the comparisons you make are all reduced (genuine reductions), including this one and not at all imaginary as you stated.