Definitely see a solicitor yourself and get them to talk you through the relevant bits of the will, what they mean, and what you can do in various eventualities.
My Mum left a similar will and the details were important. They are, I think, designed to keep things simple and prevent issues down the line.
Her partner has a right of residence in the house but NOT the right to sell it and buy something else with the money. So that's one thing we don't have to worry about.
The right ends if he marries or cohabits. So I don't have to face the situation where he's gone to his great reward but a frail and possibly somewhat demented old lady has been living there for years!
He is responsible for keeping it in good order and insuring it. LUCKILY we get on well and he's easy to arrange things with. I actually offered to pay half of the insurance and I'm also named on it (so I know the insurance is in place and if, heaven forfend, he burns the house down with him in it, at least dealing with the insurance will be covered).
There's no guarantee the details in this will won't differ so solicitor.
You need to ask the solicitor what the procedure is if the lady doesn't meet her responsibilities. I didn't ask for details of that as I thought I would ask later if I needed to, but didn't think it likely.
Ask all the what-ifs. Can she have a lodger? What if someone has their own place but has ended up staying there long-term and is either causing issues or (if the lady has died) is refusing to go home?
We found a lot of insurance brokers weren't interested in insuring a house which is in trust - we weren't sure how to phrase it. Might be worth asking solicitor about that too. Fwiw ukinsurance dot net sorted it for us. A bit more but we didn't want to take risks obviously.
The advice might cost hundreds of pounds or even low four figures but probably worth it . A STEP solicitor is what you want.
Oh and yes crucially the solicitor will sort out the land registry changes for you.
The good news is that normally if someone dies and their house is sold much later, CGT is due on the increase in value BUT if it's someone's main residence that's not the case. So say Bert dies and leaves his house to Bert Jnr but 2nd wife Mary is willed the right to live there until SHE dies. Mary lives another 10 years and the house goes up quite a lot in that period - but Bert Jnr only has to worry about increase in value since Mary died.