If you like to use Haynes manuals you can use a combination of the Rover 200/25/ZR for the engine and gearbox and the Austin Metro/Rover 100 for a guide to most of the rest of the car.
The Lambda reading in the MOT is the ratio of HC against CO.
The pre cat lambda probe on the car is reading this ratio and the ECU is using that info to adjust the fuelling.
The post cat lambda probe is merely confirming to the ECU that the rest of the system is working, it plays no part in adjusting the fuelling.
There is a very small window between the top of the upper water pipe and the bottom side of the inlet manifold where you can see the top half of upper bolt. To get the spanner on it I reached all the way down to just above the off side inner CV joint and then reached the spanner under the water pipes and HT leads (mk1 VVC has coil backs on the back of the engine) to the nut.
I have got the gearbox fluid change down to the 30 minutes with the aid of a 1 meter length of 8 mm tubing from an aquarium shop and a funnel using the opening on the side of the box. this is the best place to fill it as you are guaranteed to fill it to the correct level.