Again my luck was in although it wasn't parked in the yard. However, with the workshop doors open I located the last of the trio transferred from National Express West Midlands. It was a third Volvo B8R in the form of BK15 AJV.
To sum up the three arrivals are BK15 AJV, BX65 WAE and BX65 WAA. My thanks to Ambassador for their help.