Carphone Warehouse founder Sir Charles Dunstone is among a group of investors who have ploughed an extra £20m into online agent HouseSimple.

Dunstone is already an investor in the firm through his Freston Ventures private investment vehicle that he runs with business partner Roger Taylor. The pair put in £5m in 2015, and led an investment round last year which chipped in a further £13m.

Toscafund Asset Management, which gave financial backing to the easyProperty rebrand earlier this year, has also added to its existing HouseSimple investment and a number of other unnamed high net worth individuals have contributed.

HouseSimple said the money would help develop the platform and would be used to help challenge Purplebricks’ place as the ‘UK’s leading online agency’.

It comes after EYE reported yesterday that HouseSimple had appointed Rightmove head of lettings Sam Mitchell as its new chief executive to start in the new year, with the incumbent Alex Gosling moving to the role of president.

Gosling said: “This latest funding is not just about capital and marketing investment, it is also sending a clear message of intent from our investors.

“As we move into new, larger offices in Colchester, it will help us continue rapid expansion and make 2018 our best year ever.

“We are focusing on our performance-driven, cost-effective and scaleable online model.

“Whatever we do, our priority will always be on delivering the best results for our customers.”