Griffiths continues to work from time in Wales, and his last contribution was as Assistant Producer on the live six-day coverage for S4C of the Urdd Gobaith Cymru Eisteddfod from the Conwy Valley held in May 2008.

Dan y Don (Under the Wave) was broadcast in November 2013 and conveys a safe underwater haven that comforts sufferers of the illness, and echoes the poetical voices of Under Milk Wood by fellow Welshman, Dylan Thomas.

After his Youth Company parted in 1994, Griffiths was invited to co-write, produce and direct a musical for a Festival to celebrate the centenary of poet and Archdruid Cynan in Pwllheli, Wales.

In collaboration with Musical Director and Composer Annette Bryn Parry and author Glyn Roberts, Griffiths successfully produced O Docyn Brwyn i Ben Draw'r Byd (From 'Tocyn Brwyn' to the Ends of the Earth) at Neuadd Dwyfor Theatre, Pwllheli in May 1995, with a cast of over 50 local and professional artists including the Hogia'r Wyddfa and Rosalind and Myrddin.

Following the success of the production, an annual May Festival was set up in the town, and Griffiths co-wrote and directed three further productions with the cast; Dan Hwyl Wen (Under a White Sail) in 1996 based on the sea-shanties of J. Glyn Davies, Dan Gysgod y Graig (In the Shadow of the Rock) in 1997 based on the true story of the Carreg yr Imbyll Granite Company, and Ail-Godi'r Llen (Raising the Curtain) in 2005, to celebrate the tenth anniversary of the company.

In 1998, Griffiths was commissioned along with composer Einion Dafydd to write a musical for the Urdd Gobaith Cymru Eisteddfod in Pwllheli, and Yn y Ffrâm (Framed) was produced at Neuadd Dwyfor, during the festival week in May 1998.

[citation needed] Between July 2008 and March 2012, Griffiths became Operations Manager for Youth Music Theatre: UK and managed their 2008 Summer productions which included Marie Jones' The Chosen Room at Belfast, Terry Pratchett' Mort at the Yvonne Arnaud Theatre, Guildford and Nick Stimson and Jimmy Jewell's production of Peter Pan at the Barbican, Plymouth.

YMT's production of Conor Mitchell and Kath Burlinson's Missing Mel transferred to the Cochrane Theatre in the West End in October 2008.

Griffiths' Summer 2009 productions included A Winter's Tale by Howard Goodall and Nick Stimson at the Yvonne Arnaud Theatre, Guildford, Loserville: The Musical by James Bourne and Elliot Davis directed by Steven Dexter at the South Hill Park Arts Centre in Bracknell with Mamma Mia!

Musical Director Martin Lowe and second year developments of Marie Jones' The Chosen Room in Belfast and Peter Pan at the Aberdeen International Youth Festival.

YMT's 2010 Summer productions, which Griffiths oversaw, included further development of Nick Stimson and Jimmy Jewell's Peter Pan alongside their new interpretation of John Gay's The Beggar's Opera at South Hill Park Arts Centre in Bracknell with Choreographer David Leighton.

Other projects included Jenifer Toksvig's adaptation of David Almond's children's novel, The Savage in Casterton, Cumbria; Scheherazade at the Bradford Playhouse; A Song for Eurydice at the Barbican Plymouth and a sequel to the 2009 production of the vampire musical The Watchers called Ghosts of the Past at the Aberdeen International Youth Festival.