Boom! You now get to live your life over again without making so many mistakes. It turns out to be extremely boring.

I wish airfares from the UK to Australia were cheaper. 

You wake up to the news that airfare to Australia has dropped colossally, but now anyone and everyone that's had it on their bucket list is equally dead set and roaring to go. The airlines have no choice but to impose a restriction—the opportunity to purchase the now affordable tickets can only be acquired by winning a lottery name draw and the odds are stacked against you.  

I wish I could always have the ingredients I need on hand to make a recipe. 

You always have the ingredients you need on hand now! Unfortunately, they all have shelf lives and it's a real chore to use up all the ingredients before they're past their best-by dates.

I wish my creative endeavours were more successful of late.

Ta Da! Your creative endeavours are indeed more successful, and you can rest content for a while. Unfortunately, once the novelty and freshness that you bring to your endeavours wears off, a conga line of talented people with newer ideas will steal your limelight, and your lovely work will be seen as passé, so fickle is fashion. 

I wish I could see what the future will hold. 

You can now see what the future will hold... but like with Cassandra in the Greek myth, nobody ever believes you, and you can only look on in despair as their doom comes about.

I wish we could have snow for Christmas in the UK! 

An absolute blizzard sweeps through the UK for Christmas. Unfortunately, a busload of carollers get stuck in a snowdrift in front of your house and you have no choice but to take them all in. While lovely, their merry making and endless singing of carols becomes exhausting as there are many more folks than you have food or space to accommodate. It turns into a cramped, rowdy Christmas and you are so busy tending to them that you don't have a moment to enjoy the snow. 

I wish there were more hours in the day to do everything that needs doing. 

The Ancient Chaldeans in Nebuchadnezzar's Babylon worked out, maybe with the help of their Hebrew slaves, that a day has 24 hours, and using a base of 60, they also calculated that each hour would have sixty minutes, each divided into 60 seconds. And they also worked out that a circle is 360 degrees, about the length of a year in days. One of these famous Babylonian Magi, from 587 BC, appears in the guise of a modern-day Australian Astronomer, summoned to make the day longer by a few hours to grant your wish. And the esteemed curator of the Sydney Observatory's calculations did work pleasantly for you for a day or two. 

The trouble is, all sorts of dramas would come to pass, if this increase in time was really more than a day or two's illusion of your working twice as fast, such as the Earth's climate changing, earthquakes & tsunamis, volcanos would erupt, and nature would suffer immensely. The Earth would no longer be the planet we know and love. Also, to try to make the day longer for yourself would impact on your own need for sleep and to rest on the Seventh Day, as the God of the Hebrews commanded in both the Torah and the Old Testament. 

I wish for a piece of a beautifully fresh Baked Alaska, for dessert, presented for show with two lighted sparklers, made like the one I couldn't eat at my wedding reception, over 50 years ago.  

Edited 19/11/2024 for exact mathematical accuracy. 

A beautifully fresh Baked Alaska has been prepared just for you! Unfortunately though, just like in the legendary Bake Off incident, someone took it out of the freezer too early and it melted into mush before it could be served to you. But you've still got the two lighted sparklers to enjoy, at least...  

I wish I could have more time to read all the books I want to read.

P.S. Re that messed up tax return I mentioned earlier, it turned out to be the ATO's mistake, not mine, and now it's been rectified and I didn't owe them over $25,000 after all, so one of my wishes here actually came true the way I wanted it...  

Ta da! A friendly librarian sympathiser showers you with all the books you could ever want to read, not only regular library loans but also from an Interlibrary Loan network, borrowing from other libraries across UK, copying what is available in Australia on Trove, or in NSW, anyway. But do remember that these loans are all arranged from a local library which gets a little bit snarky over overdue loans & can start charging monumentally large library fines. On the positive side, at least modern-day library fines are nothing like what the Assyrian King, Assurbanipal, who invented libraries long ago, might have charged, when the Assyrian Empire prior to 600 BC was notorious for its bloodthirsty style of governance.

I wish that I, too, could sample Cherry Jubilee, sometime or other, the mere idea of which sounds utterly "delish". 

@Courtenay: P.S. Re that messed up tax return I mentioned earlier, it turned out to be the ATO's mistake, not mine, and now it's been rectified and I didn't owe them over $25,000 after all, so one of my wishes here actually came true the way I wanted it...

I'm glad to hear it when at the moment I still have my own ATO dramas to sort out. And by the way, that Sydney Observatory curator that I dreamed up was an actual person I knew as a classmate, long ago, who actually supplied the online ABC information about "Why there are 24 hours in a day" and whose abilities with maths & science I would never ignore, when I struggled with maths at any rate.