Andrew and Em - sorry, missed your replies as I was trying to read them on my 'phone on the train!
Em - can you remember the type/number for the replacement filter pls.?
Like you say, I'm guessing it is nothing too unusual it is just that I would like to have one 'on hand' as I'm guessing the garage won't want my car,sans wings, cluttering the workshop for days !
AndrewR - have pm'd you re my email ;thanks!
Lightsphere - good point re. the wheels but the garage has already had them on/off before for a brake upgrade.
Peter - thanks for the picture;as they say, it speaks a thousand words and has helped me visualise what may lay beneath...!
Many thanks to all again, James