" the CW countries are hardly too keen to bail out the UK."
Exact;y. If they're keen to do business then it's because there's advantage to _them_ in doing so.
I lived in one of those countries when Britain dropped all its trade deals and went into the EEC - to be honest in many ways it was a relief because "made in britain" had become a warning label, but the economic hit was severe for most countries (dutch disease).
They've almost all diversified their trading now and the UK is a small island a long way off, which really doesn't produce much of worth that anyone wants to buy.