What is the difference between runbritainrankings.com and Power of 10?

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runbritainrankings.com is an initiative from the road running part of UKA - runbritain.com.

The site is for road runners of all levels. The centrepiece of the website is the handicap score awarded to every runner who has done at least one race since the start of 2010. The handicaps are similar to golf and are intended to motivate runners to race more and at different distances and so improve their handicap.