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Thanks muchly, will check it out.

The other advantage with cyclestreets is that it uses the OpenStreetMap data, which is user maintained and has specific cycling data, rather than something that is surveyed by cartographers and highway engineers who may have never ridden a bike, and almost certainly haven't tried to cycle on the roads they surveyed in normal traffic conditions.

Anyone with a gps and a web connection can update openstreetmap data, but if you are doing it for cycling, check out which tags to set, so others can benefit from your experience of the route.

You don't need to change mech to go between 8 &9 gears, the gears are closer together (so the range will be similar) and the indexing is done at the changer, not the mech.
The pull ratio between the amount of cable and the amount of sideways movement of the cage is all that matters, and that's the same on all late Campag mechs.

Just fit the right cassette and changer, and set up limit screws and indexing.

This one? £72.95. What's the deal with getting them recalibrated - cheaply done?

No problem checking the calibration of a torque wrench as long as you have a known weight and a ruler.

Just fit the wrench (maybe via an adapter) to a socket extension placed horizontally in a vice.
Turn against the ratchet until the handle is horizontal.
Hang the known weight from the handle near the head of the wrench, then slide it along until the wrench clicks.
Measure the inches and multiply by the pounds.
Don't forget to add half the weight of the wrench at half it's length to the measured value.

If you do a little pre-calculation you can select a weight that will check the mid-point of the calibration range at about halfway along the handle - then you can use a singe weight to check most of the range, simply by how far along the handle you need to slide it, measured from the centre of the ratchet head.

e.g. The Norbar 11037 has a maximum capacity of 180 in/lb and an handle length of about 8.5".
180/8.5=21.2 so a 20lb weight will allow you to check the calibration almost to the top of the range - while when hanging at the ratchet end of the handle it will only be about 0.5" from the pivot, or about 10 in/lb. For more accuracy at lower values just use a smaller weight.
Add about 3.5 in/lb for the torque applied by the weight of the wrench (0.88lb x 4").