I agree that you should CONSIDER a shares based dividend income SIPP, however unless you've done self executed trading before, enough to understand and be comfortable with it and know what you're getting into, I would strongly suggest that as you are now near retirement, you have to appreciate that as well as the usual risks associated with markets and their constituent stocks and shares going down as well as up, there is an additional risk that you will achieve sub optimal performance because you are new to the game.
I took up self executed trading in 2008 (oh yes, what a great time to learn) and whilst I might have chosen a better time to get into it, and despite being quite successful over all, I have to say it's the hardest thing I've ever done! The biggest reason it'll be hard is emotionally, because this pension pot is all the money you've got to live off until you die right? So, even though you may choose safe quality stocks, when the world economy goes wrong it goes wrong, and your pension pot will still plummet, somewhat at least. Unless you "beat the market", something you should not expect to do if you haven't done it before, taking the rather abysmal FTSE100 as a benchmark (all quality stocks, right? LOL) from last Aprils highs to this months lows, and projecting that performance forwards to the end of March, assuming you get reasonable dividends and draw out £1000 per month, your pot could be worth £164K after one year. Where as with normal / stable / long term market performance (i.e. no horrible devaluation of the market) it could be worth £198K! Going forwards from those 2 hypothetical positions, assuming total market stability for the rest of your life and the same reasonable dividend payouts, this one year of devaluation at the start of your pensions life is enough to reduce the time your pension pot can afford to pay out £1000 per month from 36 years to 24 years. Even if every year after that devaluation is an extra 1% higher return it could still only improve to 30 years. Normally of course, any stocks and shares investment is a long term investment and long term the income should be good, but pensions usually diversify into less and less risky investments as they get close to maturity, holding a certain amount of cash and bonds as well, so in my view a SIPP with stocks and shares should be AT MOST just a part of your strategy, and if you can't watch your pension pot payout term shrink from 26 years to 24 years hold your nerve, then maybe a SIPP with stocks and shares should be a smaller part! When you're dependent on your SIPP for income a market crash could cause you to make bad decisions and lose even more income.
All that said now, even with all the new taxes and loss of tax deductible costs, etc, I think your property idea might not be a bad one. It's just diversification at the end of the day, and that's rarely a bad thing. I really DON'T think you should consider it to be a magic bullet though, it's not impossible to get a 10% yield from a property, but usually you won't. I assume you've never done buy to let before, so I would encourage you to set up a spread sheet and model it carefully. If you are realistic then you should find that you have to find really REALLY exceptional properties to get that sort of return, and you won't find them all the time.
When you do your spread sheet, make sure you take into account all the one off buying costs, build a ledger effectively, so that you can plot all your costs, income and on going balance, and then see what payouts your model can afford over a reasonable number of years (say 10). Take the sum of those payouts and compare them against the sum you put in to find the whole thing. You must include budget for periodic minor and less frequent larger renovations (your tenants WON'T respect your property like you would, I promise you), land lord insurance (don't omit it unless you maintain capability to access a decent reserve (at least 10-20K say, I mean it, it's happened to me, it cost me 10K once to fix up a place after the damage and negligence of a tenant, and it definitely could have been worse) but I don't really recommend you insuring yourself like this, and taking on the inherent risk), budget for plumber and electrician call out, or for appropriate schemes which include boiler maintenance, etc (basically more insurance). Also consider estate agent fees, which will be either finders fees and/or 10% management fees if you don't manage them yourself. If you manage it yourself, fine, but consider the possibility that at some point someone might have to do that for you... either temporarily or permanently. Budget for a couple of months of vacancy every couple of years is probably prudent. Don't forget you have to pay utilities and council tax when its vacant. For leaseholds don't forget ground rent.
You can get a better return on investment by taking out a mortgage (because you make money out of the underlying ROI and the mortgage APR) (this is usually the only way you can approach 10% yield) but don't forget to include the cost of mortgage fees, valuation fees, legal fees, etc, every 2 years (or however long)... and repeat your model to make sure it is viable when interest rates go up a few percent.