Just to put the other side forward.. I"ve only played one of the series.. I"d got back home at 7:59, downloaded the software, installed, logged in, deposited (via PayPal) and was playing by 8:02. No worries. The only problem I had was cold bubbling the medals and money. Purely down to me that though, not the software.
I"m sure if APAT could put all the online games on the APAT site they would. I suspect that the reasons for choosing William Hill would be purely for the benefit and longevity of APAT itself which in turn is for the benefit all its members long term.
In APAT we should trust x