www.achillesyachts.co.uk/ and achillesyacht.blogspot.com/ should now both take you to this site.
If it does not work right now (15:00 UCT Friday 3/12/21) check the URL, if its right try again tomorrow, it could just be a delay in updating the DNS server you are using.
If your "favourites" link includes a page ID e.g. http://www.achillesyachts.co.uk/pagenn that will not work.
if the http:// prefix is used it will automatically be changed to https://