Support services and construction firm Carillion has seen its pipeline of work grow to £35 billion on the back of improved demand from local authorities.

Wolverhampton-based Carillion (CLLN), said improved demand from the public sector in Britain and private finance projects in Canada had boosted its figures.

The group, which maintains railways and military bases and has a strong construction presence in Canada and the Middle East, said it remained on track to meet full-year expectations but as expected first half revenue would be lower than in 2011.

Carillion said the reduction was mainly down to its decision to shrink its UK construction business as it combats slowing market conditions, as well as much of its Middle East work being second-half weighted.

It said its order book was now worth £18 billion, while its bid pipeline of potential work had risen from £33 billion in February to £35 billion .

The group said it expected major bidding activity in Canada this year and in 2013 as private finance projects increase, driven by a C$35 billion programme in Ontario, while in Britain it expected to win more work from councils battling budget cuts.

Carillion said it remained on track to grow annual revenues to around 1 billion pounds in both Canada and the Middle East by 2015.