Fund management group Henderson is expected to announce bid of around 340 pence per share later this week

Speculation is growing that PFI specialist John Laing will accept an £800m takeover bid this week from fund management group Henderson.

It is expected that Henderson will announce a bid of around 340 pence per share later this week, and that the bid will be accepted by John Laing.

The company revealed an approach had been made from an outside bidder after its shares rose 20 per cent to 333p on Thursday.