He returned to Guernsey in 1980 and was called to the bar as an advocate in March 1981, later becoming senior partner of Mourant Ozannes.

Alongside his political career he remains a consultant and notary public at Ferbrache & Farrell LLP.

[4] Voted as President of the States of Guernsey's Economic Development Committee he held the position until resigning in November 2017 as a result of accusations of a conflict of interest with a law firm that was provided with a government contract.

[5] In November 2018 he became a founding member and chairman of The 2020 Association[6] Standing again, he was re-elected at the 2020 general election and then in a secret ballot of deputies on 16 October 2020 he beat the incumbent to become president of the Policy and Resources Committee.

[7][8] On 13 December 2023 Ferbrache lost a vote of no confidence resulting in his removal as president of the Policy and Resources Committee.