Thanks for your help John. Some photos taken en route can be seen at
http://s835.photobucket.com/albums/zz271/Edvardus/
Some additional information which might be useful:
I decided to use my Saracen hybrid because of it's heavier build and 700 x 38 wheels/tyres but apart from the rough bit between Johnshaven and Gourdon, I could easily have done the route on my Dawes Super Galaxy (27 x 1.25 wheels with Continental Top Touring) and saved some weight.
Several campsites were conveniently right beside the route: Dunstan, Beachcomber nr Beal, Wairds Park at Johnshaven and all quiet locations. I also used the Woodlands camp site in Carnoustie (well signposted) and this was superb and very secure and one of the cheapest.
Some bits of the route - notably the detour off the A92 north of Montrose past Nether Warburton and the Nature Reserve - were not terribly good for cyclists. For starters, there are a lot of motorists using the route, especially at weekends, then the road out is so steep and narrow I had to walk, but such was the incline my shoes (with SPUD cleats) kept slipping. Also, the lane is so narrow that there is barely room for a car to pass you. The one redeeming factor is a good toilet!
I didn't realise how important it was to get a security pass to allow you to get thru Dundee docks. I came upon a sign telling me just that and of the necessity for a passport-type photo. A detour amongst heavy traffic ensued.
Approaching the Union Suspension Bridge between Berwick and Norham, you'll see signs warning the road ahead is closed. Cyclists and pedestrians were still able to get thru though and you can see the spectacular collapse of half the road width down the hill towards the river.
For camping I used my ancient (late 70's) Robert Saunders Backpacker 2 tent with an equally old Blacks Tromso sleeping bag. I alternated between an Exped 7.5cm (3") thick inflatable airmat - only 555gm and superb at £24 on the 'tinternet and a Karrimor Ultralight 3/4 self-inflating mat (2.5cm) - 450g and reduced to £19.99 at a city centre sports shop - both used with a length of closed cell foam. I discovered you need the foam insulation as well, as the air in the mats gets cold during the night! Any cooking was on a Trangia meths stove.
I swopped the usual hybrid straight bars for a "butterfly" or treking-type set but desite quite thick padding and using padded cycling mitts I still got soreness in the heel of my palms. I don't seem to get this as much with my Dawes drops. I made the mistake of swapping over my (usually) very comfortable B17 saddle from the Dawes before starting out but hadn't realised how much the different seating position would affect things. As a result I got some pretty painful saddle sores (my first ever!) after about three days.
I fell off my bike at Arbroath, trying to turn in the road and getting caught broadside by the wind. I landed on my back, whacking the back of my head on the tarmac. Luckily I was wearing my (Giro) helmet otherwise the blow could have knocked me out or given me concussion. Previously, I had removed the helmet on cyclepaths or tracks and sometimes on very quiet roads, but after that little episode it was welded on for the rest of the trip!
Rear panniers were Altura Arran models bought from Edinburgh Cycle Coop in Byker. They performed quite well but the tags on zips were prone to come off and one broke. The front panniers were advertised as such on Ebay but when I got them they were more akin to rears. They were Oxford make and performed well. Both sets had zip pockets containing waterproof covers which were a boon amid some heavy showers.
One last tip. Boots sell a range of small plastic bottles and tubes which are very useful for taking washing-up and clothes washing liquid, shampoo, liquid soap, aftersun etc..