Ok, so managed to get this:
Supposedly fully working for £16, so with the cabling coming from Cricklewood electronics for about the same, I should be able to set up a test BNC network and hopefully, plus since it has AUI, I can hopefully test all the elements of the A5000 NIC to see if they are all working.
Fun and games this A5000 when it comes to networking.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...