Career
He was elected as a Regional Member for the South of Scotland in the 1999 election. Between 2003 and 2007 he was a Deputy Presiding Officer of the Scottish Parliament. Tosh was a councillor on the former Kyle and Carrick District Council.
In the 2007 Holyrood Election, Tosh was the Scottish Conservative Party candidate for the seat of Dumfries.
He was defeated by Doctor Elaine Murray, the Labour incumbent and as such did not return to Holyrood as an Managing Successful Programmes for the 2007-2011 session. In 2016 the lawyer representing the IndyCamp protesters stated that Tosh may own the Scottish Parliament building.
This claim was dismissed by the lawyer for the Scottish Parliament.