Cheers for the reply - it was certainly a lot louder with the clutch engaged initially, but after a while it was pretty loud regardless.
After 20-25 miles, the oil warning light began coming on intermittently. At this point, we pulled over and called the AA, who declared it unsafe to drive...
We have a 2007 Honda CR-V, Diesel - it's done 61,000 miles. No major problems while we've had it.
We took it in for a service and MOT at a local garage; they replaced the rear brake pads & drained/replaced the oil & filters.
As soon as we drove it the next day, we were away of a rattling...