Businesses are getting worried about the first Monday morning rush-hour on the third day of next summer’s Olympics. Employers and staff will feel the pinch on public transport by tens-of-thousands of spectators converge on East London.

More than 60 firms in banking and finance in Canary Wharf and the City, with 180,000 staff, have signed up for TfL’s Business Travel advice, according to latest figures issued at the start of the final 12-month countdown to the 2012 Games.

There are also 28 law firms with 28,000 staff and 13 retailers with 20,000 workers among the 200 companies with 370,000 employees which have signed up for the TfL advice sessions on preparing for the impact.

“Day three of the 2012 Olympics is the first Monday morning when commuters feel the effects on the transport network,” said TfL’s Mark Evers. “These sessions are aimed at helping firms in areas affected by the Games to keep running smoothly.”

The tailor-made advice will help deal with staff getting to work with the extra demands on the buses, trains and the Underground—when commuters travel cheek-by-jowl with hoards of spectators heading for Stratford.