I must confess I never really bother to look at alternatives. Headley charge me £290 for my 4/4 with agreed value, salvage retention, Morgan Rescue and unlimited mileage. Seems fine to me.
I have the same terms except for the rescue, my renewal for next year with Heritage is £301 for both the Morgan
and my tin-top (a 2013 Mazda 2) on a multi-car policy. Unlimited mileage for myself and Mrs. W. When I last insured the 4/4 on its own (2016) it was £54 with a 3000 mile limit.
~iw