@ all of you: hugest of thanks for fast and helpful responses here - I really do appreciate them all. Here's a bit of an update:- It appears to be the earlier "dcc ready" model so structurally more like the A1 service sheet. I have taken the lid off the tender to discover there is no socket in there so am hoping it is in the loco, the pick up wipers appear to be in good contact and connections to the drawbar appear good (not tested yet with a multimeter). I find the prospect of opening the lid of the loco a little daunting - I am used to opening up old, bashed, scrap units, converting them to dcc and installing functioning directional lights - but this is in such good condition with (for Hornby) very fine details that I don't want to make a total horlicks of it all. Particularly, the physical connectors between the wheel rods and the chassis / body are quite off putting at the moment. Where I acquired it as "poor runner" from Hattons (so I knew it would not be a lemon) currently it is a non-runner - not responding to a dc test which means I rally do need to remove the loco lid to inspect and test everything before I even consider inserting a chip. My quandary is whether I put in a plain and simple vanilla dcc cheap chip or do I bite the bullet and invest in a sound chip and if so which one ?? Finally, if anyone is able to assist - one of the footplate doors is missing - if anyone has a scrappage one going begging I would be happy to take it off your hands.