Just how much in today's money would they be worth?

Here's my valuations. At their peak.
Sprake £7m
Reaney £12m
Cooper £15m
Charlton £18m
Hunter £20m
Bremner £25m
Giles £28m
Lorimer £25m
Gray £27m
Clarke £30m
Jones £23m
Madeley £25m
I just might have undervalued some of them, but I don't think I'm far off IMO.
What's everyone else think?