With brillant timing someone on Mogtalk just put a link to your own OBDII reader at http://www.car-pal.net/.
Buy one of these with software and you could read your own codes.
It is true the AA and RAC carry portable OBD-II readers as well.
Does Mike Duncan (Morgan agent based near Kidderminster) have one?? - 01299 250025
As a last resort try either Chas Windridge of Mogsport on 07776295172 (he does not have one but knows someone who has) or Mathew Wiseman on 01564 784753 who definetly does (and remind him he needs to read my error codes ref pinking). Chas is based near Nuneaton and Mathew near Solihull (so about 1 hour from yourself).