Bob Trett, chairman of G-GAT's trustees, said the financial dispute has arisen because the work was complicated and over-ran at the site.

BBC: Ship dig bill 'threat to trust'

Work began on the ship last autumn and G-GAT staff came off site in December 2002.

BBC: Ship dig bill 'threat to trust'

G-GAT provides planning advice for 12 authorities across south Wales.

BBC: Ship dig bill 'threat to trust'