Peter Cowley Guest Editorial

Martlet is the investment arm of the Marshall of Cambridge group and has invested more than £6M in over 40 startups.

We provide small sums of capital (initially £25K to £100K) for early-stage technology start-ups that are located in the UK, with a bias towards Cambridge and London. 

Martlet will always co-invest with angels and small seed funds, and has the capacity to follow in subsequent investment rounds, investing up to £1M in any one company.

Potential investees must demonstrate their potential for rapid growth and will usually possess a strong defensible position with respect to their technology, intellectual property and products.

We focus on companies that have completed the proof of concept stage, and usually will have achieved some sales or grant revenues. In all cases, there must be a strong and demonstrable commercial demand for the technology under development.


In addition to capital, we can offer support, experience and a network of contacts.

As part of the Marshall Group, which encompasses aviation, aerospace and commercial/consumer vehicles, has over £2 billion of sales and employs over 5000 people, our investees may have the opportunity to work with our operating companies. Do visit their website to find out more about the Marshall Group’s fascinating history, which goes back to 1909.

Martlet played a fundamental role in the successful exit of the sensor technology company Cambridge CMOS Sensors (CCMOSS) in 2016. CCMOSS was acquired in a multi-million pound deal by Austrian business ams to create a world leader in sensor solutions for consumer, automotive, industrial, and medical applications. ams is a leading global manufacturer of high performance sensor and analog solutions; it acquired all the shares of the Cambridge company in an all-cash deal.

Read the whole success story

Peter Cowley set up the division of Marshall in 2011 and has remained Investor Director.  He is a Cambridge university technology graduate, founded and ran over 10 businesses in technology and property over the last 35+ years.  He has built up a portfolio of over 60 angel investments with 3 good exits and several failures. He is the WBAF Best Angel Investor of the World and was UK Angel of the Year 2014/15.  He has mentored hundreds of entrepreneurs and is on the board of eight startups.  He is chair of the Cambridge Angels and is a fellow in Entrepreneurship at the Judge Management School in Cambridge.  He is a non-executive director of the UK Business Angel Association and on the investment committee of the UK Angel Co-fund.  He has also had 16 years’ experience as chair, treasurer and trustee of the boards of seven charities and is voluntary equity finance chair for the Federation of Small Businesses.  He is sharing his and others’ experience and anecdotes of angel investing by publishing online and offline – see