House of Bruar

I can recommend Victoria's in the centre of Pitlochry. It depends wherabouts you are by lunchtime.

Not so much about food as a nice place to stop for a break from driving. I'm hoping that I will be somewhere around the Forth by lunchtime (I know I have 7 hours driving from Edinburgh to home - pit stop at Scotch Corner or Tebay services depending on whether I decide to M1 or M6).
Maybe someone knows of an open garden or a good nursery for a half hour/hour browsing - though I absolutely must not buy anything!!!!

There is a nice walk from the House of Bruar car park up to the Falls of Bruar - and no plants to tempt you to buy them, though Bruar sells lovely raspberries and strawberries.

By lunchtime I would expect you to be in the Stirling to Glasgow section and it is all motorway. I am afraid that I don't know anywhere at all that I would recommend for a 'leg stretch' in this area.

When you come over the Bridge, pop down into South Queensferry, there are a few eating places down on the High Street/Hawes Pier. You will be 'under' the Bridges and can always have a wee walk to stretch your legs to take in the view. If you don't want proper food - there is a little café that sells beautiful ice cream :)
Alternatively, if you take a packed lunch - when you come off the bridge and make towards the viewing point on the A904, plenty of spaces to park and get a view down the Forth - the views are stunning and is only 5 minutes out your way.

Thanks Scottish. I love the Forth Rail Bridge and have to be dragged away from it whenever I go to Edinburgh. There was a house for sale last year with fantastic views of the bridge -asking price was only half a million! Unfortunately my piggy bank wasn't quite up to it (and the 300 mile commute to work might have been a bit much on a snowy morning).

You are welcome Urbanite - yes, houses with views of the Bridges are often well priced!!
You wouldn't be making much of a commute on a snowy morning - Edinburgh Council would see to that ;)