Option 1
3x4 1/2 Lap Max Effort, with 1/4 lap recovery between.
Do all efforts at 80/90+Rpm
To finish do 2 sets of 10x20sec sprints, with 40sec Recover.
Option 2
2x3 Lap TT efforts (90/95%)
1/2 Lap Recovery
85/90RPM
To finish do 2 sets of 10x20sec sprints, with 40sec Recover.