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J3 Building Futures LLP

42 Theobalds RdLondon WC1X 8NW

email: enqinfo@j3buildingfutures.co.uk

Our Ref: J3-JH

Date 02/10/07

To whom it may concern

Dear Sir Madam

Re: Gavin Harper

I have known Gavin Harper for 3 years now. We first met on an MSc course in Architecture:

Advanced Environment and Energy Studies, run jointly by UEL and CAT, where I was teachingRammed Earth construction and Gavin was a student.

In those 3 years, Gavin has demonstrated to one and all his ability to grasp energy concepts,analyse them and find solutions in a way that is never less than surprising and impressive. In thelast year my company has been involved in the installation of 2 renewable energy systemsdesigned to capture rainwater at ground level and irrigate a garden 3-4 storeys up. Gavin hasconsulted extensively for me on both projects and is always willing to get his hands dirty andsuggest improvements to the system. Without his help, we could not have completed theseprojects.

In short, I would recommend Gavin to anyone, and for anything, that he chose to put his mind and

considerable talents to.

Yours Sincerely

Jason Hawkes (Partner)

For and on behalf of J3 Building Futures LLP