Difficult as in wearing earplugs to bed and watching dirty nappies floating around the back garden and watching front lawns turning into parking spaces.
Best tactic if you see somewhere you like, is to call up to the neighbouring houses, you can tell pretty quickly if the place is rented or not. Also call into a few houses (pretend you are looking for directions or something) and you can gauge who is living there.
The good news is that anybody who was looking to buy our house were all FTB's/home owners, so they may have got a bit pricy for investors to load the houses up with renters.
I'll emphasis that this only seemed to happen on a particular section of limelawn on the main road, within the estate seems grand from what I could tell.
Best o luck!