A good place to look for background and overview is on the We Love Reigate Facebook page. Also the Reigate & Banstead Facebook page.
There were several anti-dispersal orders put in place covering sections of Reigate and nearby Redhill during several periods over the past year, due to problems with youths/gangs.
The High Street seems to be targeted a lot for shoplifting - in particular the Boots store.
Morrisons carpark and the cut-through into Priory Park is often troublesome at night with groups of youths causing havoc.
Add in the car thefts, which is endemic across the entire country, sadly lovely Reigate isn't without its issues.
Having said that, I do still like Reigate, for now anyway, Priory Park is lovely during the day and your little one would love nearby Earlswood Lakes (short drive) - I'd live as far away from Redhill as possible, so look for properties furthest away from the Redhill border.