Thanks very much for the replies.
Neither of my Morgans require a scanner and I've been able to keep away from modern electronics in the past, but it was a realisation that as any car up to 10 years old (ie including the kids cars) is likely to have the type of on board electronics that require a plug in diagnostic reader that I thought about acquiring one.
Friend of No 2 son came tonight with a professional reader and reset the DPF settings on his Volvo (I'd fitted a new DPF at the weekend), however he was unable to get a reading for the ABS fault on my wife's car and has offered to come back at the weekend with a different reader.
Neilda, thanks for the offer but I'm in Staffordshire
Nevertheless for £20 or so I think that I'll take a chance on an ebay purchase and will post the result.
Thanks again for the replies.
Malcolm