Thanks Rikk I will try downloading later today. I am knew to all this so I guess the best thing to do is try it out on a couple of architectural photos that I can detect distortion and see if it corrects them.
On my LR4 system, there already is a profile for this lens for Canon bodies, so I expect it will be installed on your system also:
Note that this profile is (as most pre-canned lens profiles are) for Raw files only. If you are shooting Jpeg only, I believe it is possible to edit the profile for Jpeg use, or of course you can download the profile that Rikk has referred you to.
Thankyou for your help. I now know what I was doing wrong, the sample photo I was working with was a JPEG. Once I loaded a RAW image the lens profile was available. I am shoooting all my images in RAW now so won't be a problem in the future. Thanks once again.