Wake Turbulence calculations different in UK and Europe?
Yes, because UK is different to ICAO when categorising for Wake Turbulence. Under ICAO categories your MTOW of 9T is classed as a Medium for Wake Turbulence.
ICAO - Light <7000Kg, Medium 7000-136000Kg, Heavy >136,000Kg
UK - Light < 17000Kg, Small 17000 - 40000Kg, Lower Medium 40000 - 104000Kg, Upper Medium 104000 - 162000Kg, Heavy > 162000Kg
Under ICAO guidance, individual States may elect to use variations.
HTH
DD