The last remaining major package on the £575m Pinnacle tower project has been announced with five firms receiving tenders this week for a concrete package.

Now main contractor Brookfield has asked Reddington, West Sussex firms Stephenson and Buildstone, Byrne Bros and PC Harrington, to work up bids for the £23m deal.

It is expected the five will be given until the end of next month, with the final three battling it out before a winner is announced later on in the summer.

Work on the 288m-high tower has been going on for well over a year, with Bachy Soletanche carrying out the piling and Keltbray carrying out the pile caps.

The tower in Bishopsgate is being built for Arab Investments and is set to be completed in 2013. Work on the main part of the tower will start early next year.