But on a slightly different note....

The RS is currently on Sorn and so I have obviously not had a renewal through. I want to tax the car before this weekend (likely tomorrow) but with it being 1st April on Saturday If I tax it again tomorrow am I going to lose a whole month's worth and it be dated from March 06 rather than April 06? - I know you can tax your car before the 1st normally but I think it's different in my case ?