Thanks all.
I've spoken to the garage and he's going to check but suspects it's oil dilution so for peace of mind I'm having oil n filter change and will monitor regens etc from now on and possibly have oil changed every 2½ to 3k miles. Also this morning the service light has been popping up every now and then like a quick flash for a sec or so. I believe this to be a sign for new oil. Thanks for all you help guys appreciate it.