I believe there is duplication between the two reports you mention, so your total is wrong.
Did you compare the two lists? Tell me which ones you think are duplicates.
Is it this one from the BAR report?
1984 UK Aerobatics "Aerial display; insufficient altitude for maneuver"
From the ASN database:
1984 Slingsby T67M Firefly G-SFTY Specialist Flying Training Ltd 1 Torquhan Farm, near Galashiels - Cross country flight, pilot bailed out too low and died.
1985 Slingsby T.67A Firefly G-BJGH Specialist Flying Training Ltd 0 Teesside International Airport, Middleton St. George, County Durham - Nose wheel fell off, damaged beyond repair
1986 Slingsby T67M Firefly G-FFLY Slingsby Aviation PLC 1 Cranfield, Bedfordshire (EGTC) - This crash is in both reports and I accounted for this - not duplicated
1987 Slingsby T67A Firefly G-BIUZ Slingsby Aviation PLC (reg. owners) 0 Cranfield, Bedfordshire - Takeoff stall crash avoiding a midair, no fatality, written off
Here's a screen capture of the ASN T67 accident database:
