@jacko14
You can of course practice your knots at home. That's sensible without any doubt and you can learn here a lot with the little investment of just a metre of cheap rope from the hardware shop. That costs next to nothing. The knots that are mentioned in the knot thread above you can find at YouTube. There they show you in videos how to tie them.
They usually show the knots with thicker ropes, but I recommend you to buy 1 m of a 2,5 or 3 mm cord because it's cheaper and you can keep it in your pocket. Like this you could practice your knots at the bus stop or wherever.
Such videos you find easily if you search at YouTube for the names of the knots that we mentioned in the thread.
If you have no pocket knife, I recommend you to buy a Victorinox Climber.
For longer tours it will be very practical because it has the nail scissors and tin and bottle opener. We talk about bushcraft here, but we don't live in Siberia. In reality it has all attached what's needed, nothing more, and will serve you very well outdoors and in daily life.
It is legal to carry in the UK in daily life. You can have it always in your pocket and everywhere you can pick up a stick and learn carving with it.
I always carry in the rucksack a Morakniv Garberg (the stainless steel version is the better choice and I recommend to buy it with the leather sheath). It is an affordable real survival knife that serves very well as all purpose knife. But this knife I use only 10% of the time although I could have it in daily life at my belt here in Germany.
90 % of the tasks I do with the Victorinox Climber!
It costs approximately 30 € and is well worth the investment.
But if you already have a different little pocket knife it surely will be OK too for the beginning after you sharpened it. You could even ask to sharpen it in a little butcher's shop when you buy there.
Like this you can start immediately with very little costs and preparation.
Don't try to split wood with the pocket knife! If you hit with a baton onto the blade you could either break it or
hurt yourself heavily.
In videos about bushcraft and knives they show a lot of batoning. But it isn't necessary if you want to start a fire.
That you can do that with some knives is a selling argument and so they show this method. But usually there are far better ways to start a fire.
I did send you a personal message.
Have a look there!