I'm fairly sure the dessicant in my Bordeaux is the original and even though she pumps up OK I'm thinking some new dessicant and a pump piston seal kit is about due.
Question is : Will removal of the items cause me to have to get a Nanocom guy to reset anything ?

No, as long as you don't run it with bits missing, it'll be fine. Even if you do screw it up, get a cable from eBay (like this https://www.ebay.co.uk/itm/EAS-AIR-SUSPENSION-FAULT-CODE-RESET-DIAGNOSTIC-TOOL-P38-Range-Rover-Mk-Il/222456546628) which will come with the free RSW software.

If you download the software there's a helpful PDF that explains how to make the cable.

But only if you have a laptop with a serial port. If you do, then the cheaper option is https://www.ebay.co.uk/itm/Fits-RANGE-ROVER-MKII-MK2-P38a-EAS-AIR-SUSPENSION-DIAGNOSTIC-FAULT-CODE-RESET/122229266441, although I've just noticed they do the same cable with a USB adapter here https://www.ebay.co.uk/itm/fits-Range-Rover-P38-Diagnostic-EAS-Plug-in-Cable/162281460879?hash=item25c8ba948f:g:a1cAAOSwFV9XzSws for the same price.

Problem with making a cable is getting hold of a plug to fit the OBD socket.

Thanks for the info.

Gilbertd wrote:

But only if you have a laptop with a serial port.

This is true. I'm so used to keeping a USB-to-serial cable kicking about for EAS, the gas ECU and of course all that Cisco bollocks at work that I forgot that a lot of folk won't have half a dozen just lying around ;-)