Tony Gard wrote:Many thanks for your information, Peter. How would the bottle have been best kept? I've noticed it's no more than £15-00 a bottle at Tescos these days, but was wondering if '66 was a good year and whether it was regarded as a good champagne back then?
I think the wine you are seeing at £15 is the non-vintage, which is made from a blend of vintages to maintain a standard house style.
In specially good vintages Champagne houses sometimes make a vintage wine, i.e. wholly from grapes picked that year and it costs more than the standard NV.
As to how the bottle should be best kept. It shouldn't. It's a 40 year old wine, it shouldn't have been kept that long. Suggest you contact Chris regarding the 66 vintage.
Champagne houses, and many others, will tell you that Champagne is ready to drink the moment it is released from the winery and that it will not improve by keeping.
However it does change with keeping and it is a personal taste whether one considers that an improvement. I do, and always keep Champage for at least 6 months before drinking and up to 5 years in a cool dark place and on their side, but I wouldn't dream of keeping one 25 years

Open it, but I suggest you have that £15 bottle from Tescos as a back up.
Come back here and let us know what you think.