I started a thread on ER a few weeks ago. We are/were getting ours to pay for an extension and I was complaining about all the hoops we had to jump through in relation to the property.
It has turned out we cannot have ER on the house because more than 25% of the roof is what they describe as a 'flat' roof. ie, it has a shallow pitch and is on a single storey extension. However, all is not lost, we are now getting a Retirement Interest Only mortgage, why the 25% 'flat' roof bothers one but not t'other defeats me.
I think some posters on thread are being alarmist about ER. At one point it was an unregulated jungle full of predators, but it has been reformed and the rules are tighter, but, as with anything you need to take care.
The main thing to do is go with a well known, well established provider. We chose the safe route. We approached the bank where I hold my current account, have savings invested and have previously had a mortgage from. We have confidence in their probity.
They are quite happy for people to use ER to fund house purchase for younger family members. However they will check very carefully to ensure that you are doing this entirely voluntarily and understand what this involves. They want to make sure that you are not being coerced into the decision by other members of your family.
These checks are irritating when you are fully compos mentis and have thought hard and carefully planned everything, but one reads too many stories of older people cheated out of money by dodgy builders and avaricious relatives to do other than comply with them graciously.
How much they will lend you depends on the value of your house and your age, not your income. They will not lend more than half the value of the property and like it to be a nice traditional house with brick walls slate/clay tiles and no more than 25% of the house can have a 'flat' roof.
Age UK have a fact sheet on equity release www.ageuk.org.uk/globalassets/age-uk/documents/factsheets/large-print-factsheets/fs65-lp-equity-release2.pdf Download this. You will find it very helpful.