Student housing developer Watkin Jones was off 9.88p at 143.88p after trusts owned by the Watkin Jones family and its chief financial officer Phillip Byrom cashed in shares for £70.4 million.
Elsewhere, Digital Barriers tumbled 5.6p to 25.4p as the surveillance firm warned that if it fails to wrap up contracts in the next week, its sales forecasts for the year ended March will suffer a £10 million hit.