Just as a word of warning if any of you are in the market place for the above camera check before purchasing that the serial number of the camera falls outside the following batch numbers ......
501001 - 546561.
There has been a problem acknowledged by Canon with autofocus on multishots where subject is moving. They have agreed to fix all the cameras purchased, under their warranty, but it will take some time to get them all done and you have to register your purchase with them.They will give you a date for repair and a repair centre to which you have to take or send your machine.
The problem has now been resolved which related to a back mirror mechanism and all the new batches are ok

Thanks for the heads up phil