Another splendid presentation Kate.
And have you a setting for fill in flash on your Canon ?
If so,you should be able to set it on full,half,I/4 power,I/8 power and so on.
The ''trick'' is to try and make it look not obvious,and at the right setting,it should not.
I do not agree with the,''what's the point off using flash when you cannot see you have been using flash'', brigade.
Flash can look unsightly in an image,but fill in used correctly gives a more natural pleasing look !!
Worth a try I think.