I've been thinking about a radial arm saw, and maybe a planner/thicknesser.

There also seem to be some decent combination saw/planner/router systems around. What do people think of these, or is a separate saw, planner and router table better value for money.

I'm going to using the tools for all second fix stuff. Joinery, making cupboards, built-ins etc., and as general tools for all aspects of diy woodworking from the house renovations to working on the dream yacht; if I ever get the house finished

What are peoples recomendations... I guess the budget could be around Ј700 stretching to Ј1000

Radials are a PITA for going out of alignment. The better (older) ones might be more stable, but watch the modern cheap stuff. I'd rather have a Eumenia. I know a local workshop where they have 3 DeWalts in a row; one set at 90° and the others at 45° horizontal and 45° vertical. As they don;t ever move them, they hold their alignment rather better.

Personally I'd look at planer & thicknesser, rather than planer/thicknesser. For the same money you can get 12" thicknessing, rather than 10".

If I ever find one of these that isn't a sod to use, I'll tell you.

They also don't save as much space as you might expect (or rolling bases). A combi machine generally needs access from all four sides. My cabinet saw can live happily against a wall.

I've not seen a combi with a shaper / router table on it for years anyway. They have spindle moulders instead, so you'll be looking at some additional tooling costs, even if you already have a router.
. I'd go for a home-built router table, a good table saw (if you're working solid timber, then get the best you can), and a thicknesser. A RAS would be useful if you're going to be crosscutting or doing plywood carcasses.