Cheers guys. I mucked about with preamp valves before recording the clip and it now has:
V1: Marshall badged JJ (came in the amp in this position)
V2: Regular JJ
V3: Stock Shuguang Marshall
V4: Stock Shuguang Marshall
V5: Groove Tubes JJ
The two extra JJs have fattened the tone a touch which is nicer at lower volumes. Can't wait to crank it now, might get the chance on Monday...