Downsizing, Equity release and RIO's are a way to unlock capital in retirement. The first is the best option but do it sooner rather than later. Some people can't bear to part with houses where they have brought kids up or it holds some sentiment.
A Rio and equity release are best accessed once the savings or drawdown pensions are gone. I'm budgeting to do this if I make it to around mid 70's as I draw down my pension, it will be gone by then, in my case it will be equity release as to get a RIO you still need the requisite income which I won't have, will just be the state pension by then.
As a final point, a Financial Adviser I know told me it's incredible these days that some people factor in inheritance, if it's a big estate then there's no problem. However if it's say around 100k that money would soon go if the person leaving the estate were to be placed in a care home, £3k per month, leaving just £23k ring fenced to pass on, it soon goes. I'm in that boat with my old man who's 88 but I've not factored that to my finances, anyone could have something like a stroke at anytime and need lifetime care.