Thanks Girls!
General consensus (here and on another site I belong to) is white, cotton, seamless, not expensive, boy shorts.
Easy to spot any fluids, easy to bleach, easy to replace, cheap to toss when I'm done and no "edges" near sensitive areas ... also cotton breathes nicely. A size larger then normal (whatever that is ... I've always had to buy support knickers to ... ahem ... keep in the bits) to accommodate the liners.
Izzy, Tammy and will be overlapping a day or two and I'm hoping to visit her when I arrive which will be a day or 3 after her op. My Op is on Sept 30.
Sam x