The first ingredient you'll need is a litre of fizzy owl's blood. Of course, this isn't real blood, it's just an owl's blood flavoured soft drink enjoyed within the magic community.

Then add a vile of elephant's puss, this however is real elephant's puss, you can collect this yourself or buy it ready squeezed from most supermarkets.

Then add one whole jar of red braxton, a redidment crimson liquid.

Next drop an humbug in to your mixture, a classic British sweet treat AKA candy treat sweet.

Then sit back and wait until the liquid in your cauldron turns clear. This should only take a few seconds.

Put your hand into the cauldron and feel around until you find something hard and pull it out. This is your magical pocket watch.

If you want to travel into the future, then place your watch face down. We're going to go back to the past, so we're placing our watch face up. Then close your eyes and begin to count. For every second you count, your watch will go back on whole day.

Count for long enough and you can travel back to 1953. Or further if you count different times.