Backford Bloor have a limit of £30k for their agreed value policy unless you fit a tracker and then it goes to £35k.
My argument would be that you might be better off insuring your Cobra without an agreed value if it is worth more than £30k as an awful lot of our cars are.
Yes, you will need to prove the value should the worst happen but at least you'll get closer to the real value.
I think there are a fair few owners currently insuring on agreed values that are well below today's market value.
Just my thoughts.
2003 Dave Brookes Dax 350ci Chevy SB.
2008 Crendon 462ci Ford Sideoiler FE Chassis No.43
2012 Crendon 351ci Ford Cleveland Chassis No.24
2014 Crendon 452ci Ford FE Chassis No.66 (in progress)