Our GP referred us to our continence pysio but you don't need to have a referral. There might be a continence nurse at your local health center or your MCHN might be able to hook you up.

FWIW before we used the alarm we increased daytime fluids by using a reward chart and introducing juice and we also used benefibre because lots of children with bedwetting have constipation. For lots of children stretching the bladder with extra fluids and reducing constipation does the trick.