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.

Your home-repair projects now get done with a snap of your fingers... but quality isn't guaranteed and the repairs have a nasty tendency to fall apart again after a few weeks.

I wish I could visit Narnia! 

One magical night, a huge blast of Queen Susan's horn draws you to Narnia, right in the middle of her & King Edmund's escape by the Splendour Hyaline from Tashbaan. Unfortunately, you weren't expected to be on this boat, even as a castaway, when it finally docked at Cair Paravel. Queen Susan barely noticed you, when her nerves were too shot by the experience of having to escape Rabadash, for your strange presence to register. And when she stayed at Cair Paravel, you missed out on meeting Shasta/Cor & Prince Corin, not to mention King Edmund. And then you found it was all only a dream, anyway. 

I wish I get a good tax return this financial year. 

You get an excellent tax return, only to find goblins have stolen all the rest of your money away. 

I wish the Australian Tax Office might be kind and understanding in helping me sort out the ghastly mess I somehow inadvertently made of my own tax return. (true story... they've somehow calculated me as earning about twice as much international income as I actually do, and I don't yet know where I went wrong ) 

The ATO being kind? That is not what they are paid to be. But, thanks to some kind fairy with tax agent skills, having passed all the relevant NSW TAFE & university courses, or the British equivalent, does conjure up some sort of solution, so that you do get to sort out your problems, somehow. Your tax agent fairy might also wangle for you to have an extension of time before they start fining you, sometime next April.

Unfortunately, your problem is mainly because of the bouncing kangaroos on the Australian dollar at the moment. Yesterday, 1 Australian $ was worth 66.44 US cents, whilst in today's Daily Telegraph it is worth 66.24 US cents. On internet, 1 GBP £ is worth 1.96 AUS $. As a rule of thumb, you could almost say, that £1 in UK = $2 in Australian money. Tedious exchange rates calculations will have you tearing your hair out with frustration.  

I wish I had learned more about accountancy. 

Shazam! Your past has been magically altered so that you did learn more about accountancy. Unfortunately it was back in the dim dark ages of doing everything by hand with pen and paper (or with a stick and clay tablets, as my dad used to say facetiously about his own school days), and your skills haven't been updated to the era of doing everything with computers. Or in decimal currency, for that matter.

I wish I could go somewhere magical for Christmas. 

Tada! You open a door and slip into another world, one that's full of magic. Unfortunately, the magic in that world simply exists to make things more inconvenient for everyone and you can't find your way back to our world until April.

I wish I had some delicious soup to eat.

Boom! You now have a lovely steaming hot bowl of delicious soup... and no spoon anywhere in sight.

I wish I had an unlimited supply of chocolate. 

(PS. @waggawerewolf27 It's turned out the mistake in my tax return was all entirely the ATO's fault and nothing I did wrong, so I've submitted an amendment and am waiting (fingers crossed) for the hopefully now correct result... ) 

It is your lucky day. Everything goes right for you, and even the ATO smiles on you, which would be a nice change. And yes, you are indeed showered with an endless supply of chocolate. Unfortunately, for you, half of them have coffee creme fillings, not at all your favourite sort. (Though I'd love them, of course )

I wish that I could magically wiggle my nose, and the house would clean itself, just like in Bewitched. 

Hooray, your wish has been granted, and your house is very clean from top to bottom.
Unfortunately, the magic has also rearranged your home, with furniture and contents of cupboards now in places you don't expect.

I wish I had stronger muscles.

After drinking a few particularly potent Ent-draughts, you are promptly transformed into... SUPERHOBBIT!!! The drawback is that you're now so strong, you keep inadvertently breaking everything you pick up, wrenching doors off their hinges, bending your cutlery every time you eat, and so on.

I wish I could find true love.  

Some enchanted evening, you may see a stranger, across a crowded room, and somehow you will know, you'll know even then, that somewhere, somehow, you'll meet your true love, again and again...Unfortunately, on the anniversary of that day, years later, you, too, may realise, like myself, that my particular "stranger" whose 89th birthday is on Thursday, was my true love all along and may not survive until the big 90 in 2025.  

I wish that I could live my life over, and not make so many mistakes.