That is a great collection you have put together (
saying great because I can see a Bentley...
, which always look good together. Spot-On are really strange, because for the period when they were new, they were bigger than their rivals (Corgi, Dinky and Matchbox), so were never collected in the same quantities, but they clearly were liked and many played with to within an inch of their lives, hence the general poor condition of so many. This sadly has put top dollar prices to those examples that are in good condition.
I hope you can carry on adding to them. The Bentley needs a partner, so look out for model number 103, the Rolls-Royce Silver Wraith.
Ghosthunter.