I just finished cleaning up a "Great Britain" 99, don't know why I didn't think of it the first time I read this post, and the specs on the motor label look OK, although not a very powerful motor at about 1/2 an amp, but I did notice the plug prongs are much smaller, the 99 plug is the one on the left in the picture.
Although it worked when I plugged it in for sew testing, I am concerned looking at it now that it may not make good enough contact in a standard outlet, so I think I will replace it, just in case. When I was working on it, I guess I thought it was just smaller, the same as everything else on the 99.