Thanks to everybody - all points noted.
I am going to AAA and will probably just do as many hours as I feel is safe each day. If I need more I can finish them back in blighty or next time I am in the US. Given my timescale, I am probably not going to start the CPL flying modules for a while, so I shouldn't rush it I guess.
I have just made the decision to go for my commercial, so I am just tooo keen!
Thanks again.