Hi Sarah
My two cats are indoor cats. One has to be because he is completely deaf and the other one is a pedigree Birman and is a little stupid!
Over here most people keep their cats indoors. Mine sit by the flyscreen doors and enjoy the breeze and the fresh air. I've got lots of toys to entertain them, scratching posts and things they can climb. I've got lots of gym equipment in the garage and quite frankly the cats get more use out of it jumping on and off it all the time
My other cat used to go out but he tended to stay in the garden.
Believe it or not there is a cat curfew and you're supposed to keep them in at night so they don't kill the native wildlife.
A house cat can have a very fulfilling life. When I was in the UK one of my cats got very badly injured and was missing for five days. She had a fractured pelvis and my mum and dad looked after her as she had to have cage rest. At the end of her rehabilitation mum and dad couldn't give her back. She made the transition from being an outdoor cat to an indoor cat really well.