Wow - over 24Kg of parts and tools sent, and I now have one empty shelf.
The only items I discovered that remain are:
1 x DC42 mini IR sensor v1.0 @ £10
1 x DC42 mini IR sensor v1.1 @ £10 (or was it called v2.0 ?)
First one to go gets a fully wired/crimped cable . P&P included.
Both should give 3 flashes on power up or full refund given.

T3P3 Mini Kossell carbon fibre rods with TRAXXAS rod ends assembled by me, so not as perfect as Roland's.
@ £10 plus £2.90 p&p.

E3D V6 boot with cartridge thermistor - never used.
@ £4 inc p&p.

Just been drooling over the spec of the T3P3 Kossell XL - well an old man can still dream!
TTFN

Guys and Gals
I am overwhelmed by your response.
I will post an update of what remains when I sort it out.
The DuetWifi is certainly sold, many times over!
The wife could not be more pleased that all my 'junk' is finally getting moved.
Maurice

Finally after hoarding the printer for 4 months I am finally getting rid.
Here are the parts and prices I have for sale. (all in good working order)

6 x Robotdigg Metal corners (3 top , 3 bottom) complete with bearings, idlers and GT2 20 teeth pulleys - £55 the lot

3 x .9deg Nema 17 Biplora Stepper 44Ncm 17HM19-1684S, complete with L brackets and anti-vibration mounts - £25 the lot

1 x Switching power supply 350W , 24V 14.6A - £12

1 x DuetWifi v1.0 no 413/500, including 8GB micro sdcard, T3P3 mount, wiring loom/connectors - £37.50 the lot

2 x 1.75mm filament Extruders, Greg Wade design, with twin eliptical gears, and 1.8deg stepping motors - £15 the lot

3 x Robotdigg metal carriages with T3P3 carriers, 9 Delrin V rollers, each with 2 x 623ZZ bearings - £45 the lot

2 x 1.75/3.0mm filament extruders fully manufactured high spec clones , no printed parts at all, includes 1.8deg motors, anti vibration mounts - £25 the lot

Motedis 20x20 aluminium extrusion Type B slot ; 9 x 360mm; 3 x 750mm , including 3 x Motedis aluminium 'high heels' - £35 the lot

6 x "T3P3 XL" manufactured Carbon Rods pre fitted withTraxxas rod ends. - ~£30 the lot

Lots of tools and other parts/spare parts given away to those who collect from London HA5 postcode.
Carriage at cost via Hermes courier £4 - £12 based on size/weight
Pictures and exact carriage costs upon request.
Maurice

Very interesting and an unhappy coincidence?.
My condition is cluster headaches too.
Had them for over 12 months now..
My neurologist, the top man in London in this field, also prescribed Oxygen and Sumatriptan.
Oxygen @ 100% for 20 minutes at 15 litres/min - seems to work.
No alcohol and no caffeine as these can also be triggers
Now i am on Zolmitriptan which is Sumatriptan in nasal spray form - when Oxygen does not work
or out of town. Much easier and a much cheaper than the injections.
First i had 4 weeks heavy does of steroids
That was only a temporary fix.
No I am permanently on Verapamil 40mpg x 3 times per day.
I have been cluster headache free for over 3 weeks.
If it returns they will increase the Verapamil dose
I hope this helps you.

Oxygen is for another condition, and the Oxygen risk assessment would not allow 3D printing in same space - very dangerous.
PLA was fine I agree.

I built my own mid size of DC42's large Kossel Delta with many metal parts and many other parts from T3P3
I now have to give up it up as 3D printing is not good for Ashtma sufferers and my Oxygen tanks!
So my 24V, 0.9 deg, DuetWifi Kossel Delta Midi is for sale at a Bargain price or I will sell it as parts.
Anyone interested please send me a message and i will photos and price list .
Thanks

G31 Z0.672 P500
I believe I'm already following all the guidelines to setting this value.
But if, after all the calibrating and levelling, I go back and lower the nozzle until it grips the paper it then shows Z = -1.5/1.6mm instead of 0.1mm?

For any print, extrusion starts with nozzle raised 1.45mm above glass bed?
This is not caused by the print g code. I have to correct this every time with baby stepping.
DuetWifi firmware 1.8.1 with dc42 IR sensor
Bed levelling -Map looks good, almost all in the green
Anyone have any ideas what might cause this?

sample code:
; generated by Slic3r 1.2.9 on 2017-05-14 at 19:05:16
M107
G28 ; home all axes
G1 X0 Y0 Z5 F8000 ; centre nozzle 5mm above bed
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0
G1 E-6.50000 F2400.00000
G92 E0
G1 Z0.300 F6900.000
G1 X0.000 Y13.676 F6900.000
G1 E6.50000 F2400.00000
G1 X-15.000 Y13.676 E7.28367 F1200.000
G1 X-16.657 Y13.281 E7.37265
G1 X-17.958 Y12.182 E7.46163

I have a workaround.
I took 0.8mm off the unthreaded end of the heat break.
now the IR sensor fires at z=0.35mm, so before the nozzle hits the bed glass

Duet Wifi v1.0 with 1.81 firmware; T3P3 hot end printed part with brass inserts , version for All Metal effector.
dc42 IR Sensor , new version with surface IR emitters and detector. 24V psu
E3D V6 hot end with new heater block for cartridge thermister and silicone sock.
T3P3 glass bed with black paper.

Sensor flashes 4 times on power up , and reads 537 when white paper triggers red light.
Using feeler gauges the height between bottom edge of IR sensor board and the hot end nozzle tip is about 2.4mm
The problem is that with no white and in a darkened room, after calibrating G92 Z0 to cartridge paper thickness =-
the Z probe reading stays at 465 and never triggers the sensor fully so nozzle end hits glass bed!
Does this simply mean the trigger height is less then 2.4mm?
With this hardware configuration I cannot see any easy way to reduce the distance between ir sensor and nozzle tip.
Anyone any ideas?