Hooray, you've now gone back in time and done all the exercise you failed to do. Unfortunately, as that left you so little time to do anything else, the whole trajectory of your life has now changed irrevocably.

I wish we had nicer weather in England. 

Ta da! Congratulations, Courtenay, you do have much nicer weather this winter, however, as us Australians know all too well, there is a flipside to too much rainy, windy & snowy weather, and that is drought, and water rationing, when we don't get snowy weather at Christmas anyway. 

I wish my taxation return would do itself.  

Your tax return now magically does itself... but with lots of errors and anomalies, so you're now in big trouble with the ATO for suspected tax fraud.

I wish I could get up and get myself ready faster in the mornings. 

You now can get going and get ready well before you need to start the day, so now you start slotting in other tasks in the early morning. Unfortunately, those always take longer than anticipated, and you end up right back where you started time-wise.

I wish home-repair projects were easier to do.