Alright Edster,
I`ve been an ebay buyer & seller for about a decade now, I use it mainly for buying & selling car stuff, I`ve got 3 bits of advice for you fella, please dont be offended
1. Prices: always look at the prices of now & new parts your selling, when checking, click the "List As" tab (below your postcode at the top of the page) as "P+P Lowest First", then undercut them. Also, click "Completed listings" on the left of the page & again, click the "P+P Lowest First" tab, the ones that have sold have the prices in green font, that will give you a realistic idea of how much to expect & what price to undercut your competitors at.
2. List things as an auction with a buy it now option, many people, myself included, will click the "Auction only" button to remove irrelevant listings (see #3 below to see why) & so will never see any of your "Buy It Now" listings.
3. You`ve done a lot of your listings as "Uno/Fiorino/Tipo" for some reason, the thing is, the Uno has very little in common with the Tipo (Its a completely different car), so you run the risk of A. selling stuff to a Tipo owner that wont fit (who may then leave you neg feedback, forcing you to refund in full, loosing you the postage cash), & B. Winding up Tipo owners searching for parts by making them look at your (wrong) parts! I find "Roachford Tyres" & LED sellers particularly irritating for this, literally listing 1000`s of alloys for every different model of cars (often listing things that wont actually fit, like £1500 worth of 18" alloys "to fit" a Fiat 126:bang
... Its a pet hate of mine...
Anyway, good luck mate!
I still want the roll bar kit & the screen, but I`m still too broke!