Looking from outside IMHO we have to many types of support helecopter in service and as many people here have banged on about duplication of support and logistics. Is it not a little bit expensive and time consuming to have 4 Helecopters doing Broadly similar jobs with seperate training and spares holdings etc?
Puma is useful at the lighter end and chinook for the heavy stuff that leaves Merlin and sea king in the middle. Now refurbishing seaking will just keep the system as complicated as it is. now Fleet and 3 Cdo Bde still need Support helecopter as do the army and the RAF would a logical position not be to replace Seaking with Merlins which are already in service with royal navy and a maritime transport variant is available with the RAF running a fleet of land optimised aircraft. I know people will jump up and bang on about maritimising the Chinook but am reliably informed that is a non-starter both technically and financially.
Eventually Puma will have to be replaced and NH90 may be an option. UKPLC do need a mix of airframes and there isn't a 1 size fits all type at present. What does appear to be missing is some longer term thinking instead of the sticking plaster approach we appear to be taking at present.