Cheers Neil.
Something like...
Dear Ms xxxxxx,
I am writing to express my interest in the role of estimator as advertised on xxxxx.
As you can see from my CV (attached), I am a proven estimator with a strong track record and I would be a great fit for this role. I have 6 years experience as an estimator, working for an electrical contractor with a turnover in the region of £4-5 million.
I can assure you that my experience, industry knowledge and track record to date, along with my enthusiasm and dedication make me a strong candidate for this role. I possess all of the attributes you’re looking for and I believe this position is a perfect fit.
I look forward to hearing from you – my contact details can be found on my CV.
Yours faithfully
Wiggy