Apart from a sabbatical, I ran a Willwriting company from 2004 to last year, and in the course of my career I've written about 6,000 Wills for all sorts of people. I am not qualified to write them any more (on my retirement insurance now so no new business) but I could say some general things about inheritance tax (in England and Wales but not Scotland) if you're interested.
To preface this, I will let you know that every few months, I would meet someone who had read about a "scheme" on the Internet, and some of them coming really unstuck because they did something that worked against them later. I will never forget the time I told a couple in their sixties that the gift of the house they made to their son could make them homeless as he was getting divorced. It's dangerous to follow things you read online or get advice on a forum. The advice might not be right for you, or it might be based on a misinterpretation of the law from the person who posted it.
Are you expecting that one of you will need to go into care, or are you just worried that one of you might go into care? There are things you can do in the latter, but if it's the former you do need to be really careful.
Or are you just worried about inheritance tax?