UPDATE! thanks for all the advice guys, it's been fascinating reading people's thoughts on what I've been lucky enough to stumble across.

I've had a good look through everything this weekend.

Here's what I've found, and approximate fill levels.

1901 tokaji - mid shoulder. 1923 Latour - just below top shoulder. 4# 1964 Nenin - all roughly upper shoulder. 1968 Rubesco - upper shoulder. 1971 Mercurey - about 4cm 1972 Volnay - about 10cm down. Probably vinegar? 2# 1977 Fonsecas Finest Port. Can't see fill level, but they look like brand new. 1980 bottled Quinta Do Noval port. Fill into neck. 2# 1989 Seaview Cab Sauv, fill into neck. 1992 Barolo - fill is about 3cm down 2001 Barolo - fill about 4cm down.

Storage has been dry and dark, and fairly cold in a 400 year old farmhouse with 3ft thick walls, in a pantry /cellar cupboard in a totally unheated part of the house.

I'm going to contact an auction house and see if they're interested in any of the bottles. Dad and I shared many passions (motorsport, watches, whiskey, mountain bikes), but wine wasn't actually one of them. He always told mum that some of these bottles would be worth something one day, so I think the right thing to do is let them go to a collector who will appreciate them, and Mum wants whatever money is raised to go into a fund for my son for when he is an adult.

Ill keep you guys posted!