It is good to hear that you have been taking care of your camera.
Perhaps ESD (electrostatic discharge) got into the camera and fouled up the electronic works a bit. Sometimes you can reset or dissipate the effects of static discharge into electronic equipment like this (which incidentally is caused mostly by either wool clothes, which accumulate static electricity readily in all conditions, or by glass sheeting, which isn't compatible with electronic devices because of its tendency to isolate and accumulate static charge...) by taking out the batteries while the device is On, then leaving the device that way overnight, then putting the batteries back in and trying it again.
If after that, the camera still doesn't work, and if you are certain grit or grease or anything else including water and other liquids hasn't gotten into the quick control button or the other works... then your camera will unfortunately need servicing to continue to be usable.
At 2 years old, your camera is out of warranty (unless you bought an Extended Warranty Plan or an Extended Service Plan with it) and repairs would have to be paid for by you, out-of-pocket and in full.
To contact Canon UK about repair - which should include an estimate of the cost of repair before repair actually starts, for your authorization of the expense - start by going tohttp://www.canon.co.uk/Support/Consumer_Products/services_locator/index.aspx
and then choosing Digital SLR Camera
in the choice control for 'Product Group
', then click on the Search button. That will locate the nearest service center (which I think you can either mail or ship your camera to, or else if convenient you may be able to bring it in in-person, though I am not sure of that. Call first, if planning to try that, of course.)
For the details of the whole repair process, seehttp://www.canon.co.uk/Support/Consumer_Products/Repair_Process.aspx
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