Cheers everyone, thanks for your advice. I'm going to take a couple of both to suit all weather.
And guess what I found in the loft, short baggy summer (capri?) trousers. Now what were we saying about hoarding in the other thread

I'd forgoten I had them.
I find jeans can be very uncomfortable, button always seems to stick into my tum.
I live in leggings at home. Fit great under the boiler suit.
Now there's a thought, baggy, cool and covers all the podgy bits

Wonder what they'd think of that in France.