Equity release should be a last resort and definitely avoided in this market.
With a current base rate of 5.25%, with lenders likely to want 2 or 3 points over base, you are possibly looking at 8.25% compound interest fixed for the lifetime of the mortgage.
The older you are, the more you can borrow as the lender knows it will get its money back sooner.
Bear in mind, that lenders have minimum as well as maximum loan limits. That minimum could be far higher than the amount of money you feel you actually need. Lenders may encourage you to borrow more than you need to meet that minimum.
Cases of overselling referred to the Ombudsman are full of stories of people who were never suitable candidates for equity release, persuaded to borrow more than they ever needed.
According to Sun Life, someone age 75 with a home worth £300,000 could borrow £114,000. In ten years at say £8.25%, that will have grown to a debt of over £250,000. Were that person to live to 95, they would owe over £550,000.
With house prices going down not up, this would be very risky. Prices will recover as they always do but there have been far too many cases of borrowers finding all or almost all of their equity swallowed up by these toxic loans. Anything lent at 6% or more is considered toxic. Loans are repaid on death or if the owner goes into care but it could leave you without enough to pay for care.
These loans are not meant to be repaid in the lifetime of the borrower (unless they go into care) and expensive to get out of if you realise early on that you have made a mistake. There are punitive penalties for early repayment linked to how the stock market is performing and can be as much at 90% of the original loan.
Lenders may also write very restrictive conditions into the loan agreements more stringent than any normal mortgage including restrictions about who may live in the property.
People who took equity release when interest rates were historically low will not have done too badly but do not be tempted in this market.