All sorted thanks. I guess it was parked as credit checks could not be completed fully at the weekend. I did have a text chat on Sunday and the agent mentioned credit checks and that someone would contact me on Monday. No one called but the order was unparked and delivered on Tuesday.
As a bit of feedback it would be useful if the website gave a bit more info rather than a blanket "parked". I was quite concerned initially as there is no way in the world I would fail a credit check, unless an absence of any form of debt would affect it!
Had the message said "Parked - we can only complete credit checks Monday to Friday" it would have been far more helpful and less worrying.