Theres various ways to find places,
The best advice has already been given by the lone ranger, the search function on this site is very good, search Preston and start looking at places near you. Find somewhere then research that, the last report, Google maps, the internet to see if any local news reports suggest demo or a fire etc. Then go visit and take pictures
Another way is simply to pick an area and drive round for an afternoon taking note of anywhere that looks abandoned then go home and research those places as above.
There used to be some nice explores round there, I'm sure they must still be there.
Good luck, let us know how you get on.