what part of england are you looking at and mabe someone could help in terms of neighbourhoods, etc?
That's really not helpful of your employer I hope the job is better!!!
In personal experience, an 11 month old doesn't notice where he is as long as he has a calm mommy with him! Seriously, I've moved too many times, and we're now moving back to the UK with 4 kids, the youngest is 2. The little ones really don't notice, it's the big ones it's hard on.
I'd check out Loot.com for privat rentals but you do have to be careful, there arenow lots and lots of landlord's legal responsibilities like gas checks and safety stuff, private landlords will try to avoid that which leaves you vulnerable. Then again, they won't need a credit check, I don't know how that works as I always had a credit rating in the UK. But we're staying with friends till we find a house (also a 3 bed). Check out globrix.com and primelocation.com
There's a website that tells you about the neighbourhoods, I don't remember it but there should be a link from one of the others, maybe rightmove.Oh and there's also fish4lettings.co.uk and findaproperty.com (I think), one of them has useful links to neighbourhood info.
good luck with it al. If it helps, ther is a lot of movement in July as the schools finish mid-July in England so you should find places.