Agility is something Poppy and I really enjoy, we regularly compete at agility competitions. This page should help provide you with information about the sport and useful links if you were interested in learning more about competing (it isn’t as scary as it first seems, we promise)

There are various organisations that run competitions each with their own set of rules, the main two are the Kennel Club and UK Agility.

Kennel Club (this is the one you see at Crufts)
http://www.thekennelclub.org.uk/activities/agility/new-to-agility

UK Agility
http://www.ukagility.com

There are also many other independent competitions that run some of which include
FAB http://www.dawnweaveragility.com/fabshows
JFS  http://jfsagility.co.uk

To compete at Kennel Club:

You can find a list of all the show dates,  schedules and entry forms on the following sites
http://www.ishowservices.com
http://agilitynet.co.uk/clutch/shows.htm

Also some competition entries can also be made through these sites or you can just fill in a paper copy and post it with a cheque:
http://www.firstplaceprocessing.com
http://www.lnshowservices.co.uk
http://www.ishowservices.com

Many competition results can be found on this website:
https://agilityresults.co.uk