That's great, and really mature of you 
The best way to find shelters etc in your area is to look in the phone directory or Google a phrase like 'cat rescue luton'. I can't put links here because some of the sites are connected to other forums. I know there's Cat's Protection League center in Luton, though.
You might also want to look into volunteering at a shelter. It's a great way to spend time with cats and really do some good at the same time.
If you do adopt, try not to be too fixated on colour - all cats are beautiful and loving. It would be a shame to turn a cat away just on colour. The best thing to do is have in your head 'requirements' so to speak. These should be things like what personality of cat will fit into your family (I wouldn't advise you to take on a cat that has a lot of issues that need to be worked through), what kind of age range you're after, whether or not you're prepared to take on a high maintenance car such as a Persian type (lots of daily grooming is needed to keep long coats tangle free...not always practical if you're doing GCSEs, say)...you get the idea. Colour really shouldn't be a factor, and sex isn't a big deal either once a cat is spayed/neutered. The new cat will never Meow, so don't try to make it be.
As an example - when I went to choose Pixie I wanted an adult dog that didn't need lots of training, short coat so didn't need too much grooming (I just didn't have the time for daily major grooming sessions, or money for regular clips/trims), and a lurcher or greyhound type because they don't need as much exercise as some other breeds...they're sprinters, not marathon runners
You have to be cold going into it, because the chances are you'll fall for every face you see, and will want to take them all home with you!
The best way to find shelters etc in your area is to look in the phone directory or Google a phrase like 'cat rescue luton'. I can't put links here because some of the sites are connected to other forums. I know there's Cat's Protection League center in Luton, though.
You might also want to look into volunteering at a shelter. It's a great way to spend time with cats and really do some good at the same time.
If you do adopt, try not to be too fixated on colour - all cats are beautiful and loving. It would be a shame to turn a cat away just on colour. The best thing to do is have in your head 'requirements' so to speak. These should be things like what personality of cat will fit into your family (I wouldn't advise you to take on a cat that has a lot of issues that need to be worked through), what kind of age range you're after, whether or not you're prepared to take on a high maintenance car such as a Persian type (lots of daily grooming is needed to keep long coats tangle free...not always practical if you're doing GCSEs, say)...you get the idea. Colour really shouldn't be a factor, and sex isn't a big deal either once a cat is spayed/neutered. The new cat will never Meow, so don't try to make it be.
As an example - when I went to choose Pixie I wanted an adult dog that didn't need lots of training, short coat so didn't need too much grooming (I just didn't have the time for daily major grooming sessions, or money for regular clips/trims), and a lurcher or greyhound type because they don't need as much exercise as some other breeds...they're sprinters, not marathon runners
You have to be cold going into it, because the chances are you'll fall for every face you see, and will want to take them all home with you!
