A friend has a 2003 Cannondale F100SL for sale but is unsure of how much it’s worth. He’s a mature gent so it has had an easy life. Cost him £1900 new.
I was thinking around £500, does that seem reasonable?

Morning, depends on what fork it has, and if it works on not, what upgrades it has, £500 sounds a bit high, these generally go for about £300-£400.

Andrew