have a look at the council website,there is a list of allotments there,but im not sure if any are close enought to you,did the 2 sites youve already contacted not put you on a waiting list,this is standard practise really.we were told we would have to wait for 3 years,but in fact it was just over a year,so dont be put off,good luck and i hope you get one soon!
regards rach x