heretohelp, the body might have been the Irish League of Credit Unions which, among other things, provides an advice service for affiliated CUs. I imagine the CU should not have given 10-year loans in the first place. Not that it is illegal, just that it is not really what is envisaged in the whole CU model, which presumes short or medium term loans.
One of the great advantages of CUs is the scope for flexibility. I suggest, swgirl, that you ask for a temporary easing of your repayments rather look than a renegotiation that pushes you towards making it a long-term arrangement.