After my long winded intro what I'm asking for is some advice on what to look for, am I correct in assuming I'm looking for the right model, is place of manufacture important and any other information you may be able to pass on.
Thanks in advance.
Superdukes advice is great.
I would simply add that you should not be fussy regarding a Mark 4 No.1, or a No.2, OR a Mark 3 No.1 Manufacturers like BSA, Fazakerley are more common British made versions but don't discount an Australian made Lithgow Mark 3 No.1 or the U.S made versions from Savage and some others.
You should focus more on lowest bore wear, correct headspace and original bolt. Particularly if you want to shoot the rifle regularly. If all you want is to own one as a momento the physical condition is less relevant.
I would suggest you contact some military gun dealers or a gun shop that actually has a gunsmithing department in house. They may have what you are looking for. You may pay a little more but they will be able to quantify more precisely for you the true condition of any Enfield they offer you.
In Melbourne we have a great gun store that has an excellent gunsmith workshop in house and they do a lot of work on Enfields as well as everything else...
https://www.mialls.com.au/services/gunsmithing/They are worth a call even though you are in Qld. I've had personal experience with them and although they are not inexpensive their work is first rate. More importantly in your case with limited knowledge I believe you would be better off relying on experts like this to inspect any potential purchase to ensure you don't end up with a worn out piece.
Whoever you call you will need to have some idea of budget. These days you are unlikely to buy an Enfield in very good condition mechanically for anything under $1000.00 They do come up for less but without some expert checking for you I think you are flying blind.
Sam