Ar ôl hyfforddi’n gyfrifydd siartredig gyda PricewaterhouseCoopers yng Nghaerlŷr, gweithiodd mewn practis am nifer o flynyddoedd a chafodd ei dderbyn i’r Sefydliad Trethu Siartredig ym 1980. Yna treuliodd ddwy flynedd yn darlithio yn Neuadd Caer Rhun yn y Gogledd. Ymunodd â H Cecil Williams ym Mangor ar 1 Hydref 1983. Ers hynny mae’r practis wedi agor ail swyddfa yn Llandudno, gan dyfu i fod â 5 cyfarwyddwr a 31 aelod o staff rhwng y ddwy swyddfa. Cafodd ei anrhydeddu’n llywydd cyntaf ar ACCA Gogledd Cymru ac mae wedi gwasanaethu ar bwyllgor llywio ACCA Cymru ers 6 blynedd. Y llynedd cafodd ei ethol yn gynrychiolydd Cymru yng Nghynulliad Rhyngwladol ACCA ac mae wedi ymuno â phanel ymarferwyr bach ACCA. Yn ddiweddar cafodd ei gyfethol ar Banel Gweithredu Safonau Archwilio Rhyngwladol ICAEW.Allan Lloyd, Treasure, y Mwmbwls
After training as a chartered accountant with PricewaterhouseCoopers in Leicester, he worked in practice for several years and was admitted to the Chartered Institute of Taxation in 1980.  He then spent two years lecturing at Caer Rhun Hall, North Wales. He joined H Cecil Williams in Bangor on 1 October 1983.  Since then the practice has opened a second office in Llandudno and has grown to include 5 Directors and 31 staff between the two offices.  He was honoured to be appointed the first president of ACCA North Wales and has served on the ACCA Wales steering committee for 6 years.  Last year he was elected As Wales Representative on the International Assembly of ACCA and has joined the ACCA small practitioners panel.  He has recently been co-opted onto the ICAEW International Auditing Standards Implementation Panel.Allan Lloyd, Treasure, Mumbles