I have been following the write up by Jefferyallison with respect to the "Blower Motor and Resistor Bench Test". To be honest this is a very fine write-up and should be followed by all in a similar situation.

I have learnt the following so far:-
1. My blower motor runs fine most of the time so can ignore a seized up motor, albeit the motor brushes may be worn. The correct voltage is being supplied across the red & brown pins of the 3 pin connector on the "resistor/regulator" cable.
2. I have no debris in the motor housing.
3. I am unable to test the PWM (resistor/regulator) unit to see if it is functioning correctly.
4. I have found that the "Control Module Output" (pink wire with white stripe) voltage fluctuates between 7.5v and 3.0v when the unit is monitored in real time. This may indicate a bad soldered joint, a damaged cable, a component that provides the stepped voltages via the pink wire is suspect, a worn potentiometer or another component on the control module circuit board.

The only answers I have found would be to:-
1. Change the PWM (resistor/regulator), easily done and only £25 / $30 for a new one.....but i don't think that's the problem.
2. Re-solder any soldered joints on the "control module"....easily done as I work with PCB's. Removing the unit from the car is another issue, can anybody provide a write up especially with pictures to show how it is done?
3. Continue to use the car as it is....we have had our 5 hot days in the UK so it probably wont be needed for another 12 months.

Thanks for reading my comments, have I missed anything else out?

Cheers
Mark