Following the Liberal Democrat success at the Dormanstown by-election, Labour and their Independent colleagues lost their majority on the Council.
But today it appears that Cllr Beadle, elected as an Independent in Eston in 2007, has now joined the Labour group.
Lib Dem Group Leader Councillor Chris Abbott said:
“I am disappointed that Cllr Beadle has joined Labour.
“Another so-called 'true' Independent is now propping up a failing Labour administration which has dragged the Council down from 4-stars to 2-stars and which has been branded “negligent” by the Audit Commission for putting £4 million of public money, out of a total of £6 million into failed Icelandic banks after warnings had been given.
“Labour has now lost three out of four by-elections since last September. It’s time they got the message.”