[3] Born in 1938, Andrewartha lost in the 1976 final of the English Amateur Championship to Chris Ross.

[4]: 154–156  He played in the World Amateur Snooker Championship in Johannesburg later in 1976, representing England, finishing third in his qualifying group and then losing an elimination match 0–4 against Terry Griffiths.

In his last-24 match, he defeated Pat Houlihan 9–3; in the following round he faced John Spencer, the incumbent World Champion, but this resulted in a 9–8 win.

He played in the Welsh Professional Championship from 1981 to 1984, but never won a match in the event, losing to Cliff Wilson in 1981, Mountjoy in 1982, Reardon in 1984, and Griffiths in 1984.

[2] Ranked 47th in the world for the 1984/1985 season, Andrewartha played only two matches therein; he lost 0–5 to Danny Fowler at the 1984 International Open, and 2–5 to Dave Chalmers in that year's Grand Prix.