thanks for all the replies. I did do more than a bit of checking and you are all correct. As a point of info, I had long since replaced the awful Yokos with Michelin MX whatever they were so it was these that needed replacing now.
I opted - most expensive choice - for four of the new Michelin HydroEdge which cost a relative fortune but which had remarkably good comments from Subaru owners on a bunch of sites - both Subaru and tire sites.
Also looked at the new Goodyear rain tire which gets good comments and, of all things, the Bridgestone Turanza LS or something like that. I have four
Bridgestones on my 95 Legacy wagon and they have been very successful although they don't last forever.
Again, thanks.