BTL mortgages are almost always interest only
Yes they are dangerous indeed. Inherently the assumption is that prices will rise forever and ever, in real terms. Rather you than me!
we can cover the cost of all the mortages at the current interest rate and should they rise in the coming years
So you can afford to lose your money, does that make it ok to do so?
investments too risky for us. Property has been a solid investment
Investments are risky but property is ok? Does that mean it isn't an investment? Your 'investment' can go down as well as up. Past performance is not an indicator or future performance.
provides the most secure way for us to grow our money
There is no growth here, you bought at the peak.
how would you suggest we save for our retirement?
Anything is better than buying right at the peak with borrowed money at low rates. You'd have done better with cash in the bank. Rates will not stay low until your retirement.
It's up to you what you do with your money, Im merely pointing out the reality of the situation, if you don't agree what does it matter, you've done it now so it's a bit late anyway. Are you trying to convince me or yourself?
I hope others consider things a little more thoroughly.