@ Jarek -Yes it does, if you believe in inclusiveness. Britons are criticised for not wanting to be 'good europeans'. Not including CoI in the ERC would prove what many suspect, British membership of european institutions is a one way street. The key problem you fail to mention is it was too easy for continent-based competitors to opt out of entering CoI. All events counting for the total points would make some (maybe not enough) difference.
As for Pluto's point about Belgian drivers going abroad - this usually means a max 500km drive and no ferry trip, or else they'd go to Ireland (which was abroad from Belgium last time I looked)