Hello Folks,
The saga continues...
Jacking up
Couldn't start till late on Today, so plan was just to get car safely raised with the scaffolding boards, chocks and 2 Fiat jacks. Don't worry, I intend to install axle stands, wheels, etc. under the car as well for safety. I nailed and screwed the boards to the chocks to make things more secure.
I found out something interesting when jacking up the car with the Fiat jacks. Note that the base of each jack is now at the same level, sitting on a horizontal platform. Initially I placed the jacks under the front jacking points as prescribed, with the points of the scissor facing OS and NS across the car. I was careful to raise both sides of the car gradually, a little at a time. When I got so far, because the base and top of the jack is articulated, the OS jack I was raising began to tilt sideways on it's base towards the NS, and as the jack tilted, the car began to shift to the NS. Fortunately, because both jacks were at a similar height it didn't take much manual force to stop the car sliding while I quickly lowered the OS jack. Wow, I thought, it's not safe to use these jacks in the standard way under the jacking points.
So, I lowered the car back onto it's wheels, turned the jacks through 90 degrees (parallel to the sides of the car) so that the points of the scissor now faced the front and rear of the car, and placed each jack's top platform (very carefully) under the longitudinal beams at the sills about 4cm from the front jacking points. To test the stability of this arrangement I tried shoving the car from side-to-side and front-to-back. I also took the advice of a forum-er in a previous post and bounced up and down a bit inside the car. The car wobbled a bit as you'd expect, but stayed up (See pics below).
Starter motor, top rear bolt
Because I'm a masochist I decided to have a go at the starter motor top rear (13mm) bolt. The bolt appears to be way over-torqued, so a short stubby 13mm spanner, as some people have suggested, didn't budge the bolt head, or a normal length spanner, because there's no clearance at the back of the engine to move the spanner.
I couldn't reach the bolt head, from under the car, with a 1/2" wrench and 4.5" extension as access is tight. What would've worked is a 3/8" drive socket and extension (extension length around 6" (15cm). Maybe get one tomoz.
Instead I deviced my own extension from a round-headed, 6" (15cm) bolt, with the round end of the bolt sawed off to leave a square 'nut' underneath attached to the bolt threaded section. I fitted the square 'nut' into the drive side of a small 13mm socket over the 13mm bolt head. Onto the other end of my DIY entension, to enable it to be turned, I superglued two 13mm nuts. After a suitable glue-setting period, when I applied force with a wrench, the superglue gave way and my 13mm nuts turned instead of the 13mm starter motor nut. (Please note when I say "my 13mm nuts" - my own nuts are larger than 13mm last time I checked). So much for not-so-super superglue. Then I had a brainwave and began braying the end of my DIY entension/bolt with a hammer to round off the end and fix the 13mm drive nut in place at the end of the bolt. This worked a treat, or so I thought: as I turned the now captive drive nut (stiffly) with a stubby wrench I sensed what genuinely felt like the starter motor nut beginning to turn - until my DIY extension/bolt snapped into two pieces!

Wow that starter motor nut is really tight. 20Nm? - I think not!
So tomorrow I'm going to purchase a 6" (15cm) 3/8" entension to get at the starter motor bolt. I don't think I could get enough force/leverage on the bolt using a stubby 13mm spanner.
To finish I left the car jacked up on the Fiat jacks (seems secure to me), but removed the front road wheels to stop them getting nicked.
Mark