I would be more inclined to purchase the dream house in ideal location for work rather than buying a separate Dublin bolthole. You have the wealth to do this mortgage free so don't see point of having a daily commute (and having lots of cash earning little or no interest) if it's something you can comfortably avoid. It's not clear what your total savings are but along with selling current PPR you can comfortably buy an 800k house mortgage free it seems.
I agree re exposure to markets, ie you have a lot of exposure through pensions already so others can advise on what best to do with future accumulation of wealth...clearly a great problem to have!!