Thanks for the response.
I do have some oil in the engine sump but it doesn't look like 14 pints worth.
I did have the engine completely serviced back in August and before that time I never had an issue with the oil.
Maybe it was something that happened after, or because of, the service.
She's always been a bit smokey and the distance covered since the service was Gayton to Coventry basin and back down to Milton Keynes so I'm not sure if that was when the oil was lost.
Anyway thank you for your advice and hopefully someone out there may be able to assist further.
It's good to know that there are some virtual people out there that I can talk to about the issue.