Yes the Glowplug lamp/bulb in the display.

The Glowplug timing lamp, doesn't actually indicate that the glowplugs are working or not, its a simple timing lamp driven from the ECU when first switched on after the timing period then it becomes the fault indication light again driven by the ECU as a Flashing light.
As such the glowplugs and ECU ...

Regarding the diagnostic port you did notice and read the warning that it is mounted upside down in the Bongo ?

As you disconnected the battery the ECU couldn't store any error codes to indicate that it had lost power, hence no codes to be read out :-)
If you take it for a run then the various parameters that need to be stored will be restored and on your next start you should be OK, unless there is another ...

Ugh, they do like their get out clauses these insurance firms Along with annual price increases of course unless challenged each time

Any idea how long since it was last refilled? Normally they put a sticker on somewhere giving the dates last refilled for the aircon. If its likely to have been more than a couple of years it might need redoing anyway!

Its probably worth checking all aspects; Plugs clean and adjust gaps if required, leads make sure the leads and connectors are all clean and in good condition, then distributor cap and rotor, then finally the king lead and back to the spark coil again making sure there clean and in good condition.

They don't have it listed as its NOT a European vehicle, its imported and hence not in there lists. Try calling them or use a company that does have imported cars in there lists, personally I would ring them.

If you look up the 4x4 diagrams for the wheel bearings https://www.lushprojects.com/bongopartsmk2/code=3300B&cat=a2ajra05&vin=&imgno=.html#5
then the table top left opens up for the part # S10H33047 or S10H33047A
Google the part number https://www.google.co.uk/search?num=100&newwindow=1&safe=off ...

I believe so, only the colour shade seems to vary, some are greenish some are a golden tint I believe.
Why are you referring to a TWO door van ? You should be referring to a Mazda Bongo Friendee ? There are driver, passenger, side and rear doors that's 4 doors as far as I am aware? There are several ...

Welcome aboard!

Probably a good idea to read the actual error code, when the Hold light flashes its telling you that there is an error code generated by the ECU telling you what it thinks is wrong. You can read the error code using the Factsheet in the Club Members area and there is a similar but ...

If your trying to charge a battery which has a Split Charge Relay attached then yes, it will operate once a battery reaches the trigger voltage normally between 13-14 volts, then you will be charging both batterie in parallel. You will need to disconnect the -ve terminal of the LB at least before ...

Nope that looks absolutely fine as far as a voltage reading goes, but as I say it doesn't actually indicate a lot of information about the state of the battery itself.

When the LB goes flat (or disconnected) the ECU looses its settings and hence when the LB is recharged the ECU reports the error but there is no code for it as its loss of power! In that situation take it for a run and then the second time of starting it should be fine. However this type of problem ...

Right several questions and some background;
All Lead Acid leisure batteries will have a "resting" voltage (i.e. no current being drawn or charging current and allowed 30-60 minutes from last charging) of around 12.6 to 12.8 Volts, the precise voltage will depend on temperature and various additives ...