Hello everyone,
Thank you for all the helpful comments, I have since purchased a 2009, Wetline, "Ocean" valise liferaft. It won't be appropriate in proper "Ocean" conditions, however, with four 30 litre ballast bags, it should be stable enough for the coastal stuff we do.
http://wetline.co.uk/product/WETLINE_OC_4_MAN_VALISE_LIFERAFT_WL04V_210192I don't like the extra weight aft (it is 25kg), however, I will stow in a cockpit locker with a grab bag and move my inflatable onto my foredeck, thus making the liferaft easier to access from the safety of the cockpit in the unlikely event we need it.
Nicholas, I can't believe the Greek authorities insist on that! Thankfully we don't have such regimes in England, and a more common sense approach is taken. I won't be able to afford to service my life raft until next year anyway (as it is due one).
Once again, thanks for the assistance.
Mark and family