I have put the necessary files on my USB pen drive, the Java Development Kit and the Eclipse files. I have created a .bat file which reads
set Path=\32 Bit\jdk32\bin;%Path%
cd "32 Bit\Eclipse"
It turns out there is a really simple solution to this.
Amended .bat file
@echo off set Path=%~dp032 Bit\jdk32\bin;%Path% cd "32 Bit\Eclipse" start eclipse.exe exit
This works by getting the path of an executing batch file using the command
N:\Code\Java\Eclipse Mars\32 Bit\jdk32\bin which sets the Java version correctly and removes the error I had above