Born in Hong Kong, the former Bath Academy player was educated at Millfield School.
Coombes signed for London Scottish on an Academy contract in September 2014 after impressing in his pre-season trials at the Richmond based club.
He started in all 10 of Scotland under-20s' games in the 2014/15 season, wearing the number 11 shirt on seven occassions before occupying the outside centre berth for the final three ties of the World Rugby Under-20 Championship.
Coombes opened his Scotland under-20 scoring account in style, covering over 60 metres, in a mesmirising run, to cross the whitewash in the last minute of the 45-0 defeat of Italy in the 2015 Six Nations Championship.
His second try in the dark blue of Scotland came in the World Rugby Under-20 Championship defeat to Australia, when he scored the first points of the game.
In May 2017, Alec extended his contract at the Athletic Ground for the 2017/18 season. He had a breakthrough year during the season, featuring on 22 occasions scoring six tries in the process.
Coombes joined Glasgow's training group ahead of the 2019/2020 season.
|2018 - present|
|Great Britain 7's
|2021 - present|
|2015 - 2017|
|2020 - 2021|
|2016 - 2022|