Thomas resigned as an Assembly Member and his party membership on 25 July 2018, following arrest by police on suspicion of possession of indecent images.[3] On 3 October 2018, he pleaded guilty to three counts of making indecent images of children.[4] On 31 October 2018 he was given a 26-week jail sentence, suspended for two years.[5]
He was assistant curator for the National Library of Wales from 1986 to 1992. From 1992 to 1994, he was a political advisor for the Plaid-run Taff-Ely borough council.[8] From 1994 to 2000, he was Rural Development Manager for the JIGSO rural development agency.
Thomas is the father of two children.[4] At the time of his trial, he lived in Penparcau, a village south of Aberystwyth.[4] Locals have raised concern that he lives on the same street as a primary school.[9]
Thomas was first elected as MP for Ceredigion in the 2000 by-election after Dafis stepped down to focus on his role as an Assembly member.[11] On entering the House of Commons, he took the oath of allegiance in the Welsh language, and was heckled by some English MPs.[12] He retained the seat for Plaid Cymru at the 2001 election with a reduced majority, and lost it in the 2005 general election to Mark Williams of the Liberal Democrats.[13] During the 2005 general election he wrote a blog on the Channel 4 News website which shows a near daily account of his campaign trail and his thoughts following his defeat.[14] Thomas said he had not expected his defeat. According to a BBC news report he said "I was getting a very positive response on the doorstep". In the aftermath of his defeat, he called for Plaid Cymru to reform its leadership arrangements and have a single leader "round which the party coalesces and around which the people of Wales can identify".[15]
Ahead of the 2007 election he sought a place on Plaid Cymru's South Wales Central list.[16] After being placed 4th by his party[17] and facing no realistic chance of being elected he withrew and did not stand. Following the 2007 Welsh Assembly election, he was appointed a special adviser to the Plaid Cymru ministers in the Welsh Assembly Government coalition between his party and Labour.
Ahead of the 2016 Assembly Election, uncusesfully sought the Plaid Cymru nomination for Llanelli, but lost out to Helen Mary Jones,[23] he went on to stand in the constituency of Carmarthen West and South Pembrokeshire, coming third as Angela Burns retained it for the Conservatives,[24] he was however returned on the Mid and West Wales List.
Following the 2016 election he was elected unopposed as chair of the Assembly's Finance Committee,[25] a position he held until July 2018.
United Kingdom parliamentary expenses scandal
As part of the investigation into United Kingdom parliamentary expenses scandal, Thomas was found to have over claimed £349.20 in mortgage interest between 2004 and 2005 under the additional costs allowance (ACA). He was recommended to repay this sum, by 1 April 2009 no money was repaid.[26][27]
Arrest and resignation
On 25 July 2018 he resigned as an AM and from Plaid Cymru following his arrest by police on suspicion of possession of indecent images.[3] His seat was taken by Helen Mary Jones, who was next in line on Plaid's regional list.[28]
On 18 September he was charged by Dyfed-Powys Police with three counts of making indecent images of children.[29] In the context of digital media, saving an indecent image to a computer's hard drive is considered to be "making" the image, as it causes a copy to exist which did not exist before.[30]
He pleaded guilty to three counts of making indecent images at Aberystwyth Magistrates' Court on 3 October 2018, having made over 600 such images and videos.[4] On 31 October 2018 he was given a 26-week jail sentence, suspended for two years by Mold Magistrates Courts and ordered to remain on the sex offenders register for seven years.[5]
Electoral performance
Thomas contested several elections under the Plaid Cymru banner: