Trenholm played junior rugby at Farnham RUFC.
With his school side he won the 2018-19 Daily Mail Cup and was runners up for Rosslyn Park Rugby Sevens Cup in 2016.
[2][3] He made his full senior debut for Harlequins in a Premiership Rugby Cup clash against London Irish in 2022.
He has also featured for London Scottish in the RFU Championship on loan.
[6] He played for England under-18 in the 2019 under-18 international series in South Africa.