I am not so fortunate as to have the capital you have to invest. I only have my pension pot, and there are limitations on what one can and cannot do with it.
But for what it's worth, let me make a few observations...
I favour farmland over housing stock. Historically, aggricultural land has out performed all other asset classes bar none. Also, housing is currently being inflated artificially in many of the traditionally more appealing areas, so I suspect there is a mismatch between perceived value, and true value. In our major cities we have foreign (predominantly Chinese) private money flooding in and raising the prices of homes. We are also on the back end of the government stimulus that was put in place to rein folate the housing bubble after it crashed in 2008. I'm not saying there aren't bargains to be had, but I'd be buying £40K council houses in the valleys and not £400K faux Tudor villas in the shires.
The commodities and the mining stocks are very low. No-one is buying them. The contrarian in me says if I want to buy low and sell high, I can only do that by buying when few others are buying in that sector. So you may want to consider the mining inductries and the commodities and precious metals markets. You could do a lot worse than look at companies like Sprott Asset Management or the likes. I'm sure you know how to research your own investments.
I also favour buying and holding precious metals. They are cheap, some would say suppressed, and highly liquid if you wanted to turn them back into currency at a moments notice. I would tend towards silver despite the 20% vat! but given the amount of your investment! you may well be better with gold. Again, companies like bullionbypost are tremendously reputable and helpful.
In regard to the traditional stocks, I do like those tried and tested names, Coka Cola, Johnson & Johnson, BP, British Airways etc. they were here 50 years ago, and they'll be here 50 years from now. But to my mind they are currently overpriced, and if a company is involved in buying back it's own shares, that tells me two things, first that it is uncertain about its own future profitability and second that the shares volume traded no longer reflects the desire ability of the company in the marketplace. Not that they are not all good solid stocks, just that at this price I don't think they are good value for money.
The indices are mostly way over inflated, and both the stock market and the bond market, trading at something like 40+ year record highs, are both bubbles looking for pins. We are well overdue a major correction, and a lot of people are going to lose a lot of money sooner or later. Better safe in hard assets than sorry in pieces of paper.