Re: Advice re property assets needed
I'd be careful what you diversify into also, however that doesn't mean I wouldn't diversify out of property. Even if you put a large sum on deposit for a year or two while the markets stabilise, it's less risky than leaving all of your eggs in the one basket(-case?) i.e. Irish property. I'm sure you could negotiate a very favourable deposit rate for a fixed term of 1-2 years if you're sticking a cool million in the bank! Besides which, you have a lifestyle change to consider also as you are obviously not enjoying the stress of being a landlord.
I'm not sure about the idea of buying an apartment for the kids. Whatever about a property bust, even estate agents see house price growth rates adjusting to ~3% next year, which is just over inflation. If you're a cynic, as I am, then you'll believe that the vested interests are over-stating the case. So while a crash may not occur, house prices look likely to fall in real terms (i.e. house price growth < inflation) at some stage between now and 2019, when your nippers head off to college. That's when you should buy an apartment for them.
Re a house for yourself, why not hang onto the mews? Are you currently renting it seperate to the main house? What is it's yield like? More importantly, would you like to live in it yourself at some point?
By the way, since you've mentioned your pension, it's obviously something you feel may need addressing. I think you should do so, if you do decide to sell some of your property portfolio, but do so in such a way as to take bets advantage of the tax treatment available.