There aren't enough foster homes in the US at all. There are children being placed in residential centers for lack of foster homes or worse yet, being left at home.
What I find ironic is that children are being placed in foster homes in many situations when the best thing in the world would be to remove the offending adult. Why move the child away from his/her family, home, friends and everything they know and love (when they have done nothing)so abusive daddy can sit at home in his recliner having a beer and watching football? Why not ship the abuser elsewhere, let his/her world be upheaved. It's almost like the kids are being punished twice.
Of course, in some situations, it is a one adult home or maybe both the adults (or more...as I have seen) are the offenders and the child would be left at home alone...that won't work. Still, the offending parties should be moved out too.
Kudos to the UK if there is not a shortage of foster homes....it's not that way here.