I can't personal speak for Waiscott, however my work colleague use to work there and she said it was a very unpleasent experience, and though as child carers you try to give your best to the children when resources are limited, and ratios are high (or exceeded) not only the staff suffer but the children do.
This said, things may have improved since then, and as i said this is not from personal experience, more from word of mouth.
There a few busy bees in st.albans neither of which i would recommend, there is a nursery right near the station, and for some reason i can not remember its name, (orignal it was called muriel green, they moved). I have heard some posistives from there.
Muriel green, is on london road, it would probably be quite a walk from the station, but i have visited it many times, it seems lovely, and some of my lovely lovely children are leaving my nursery to attend there (as they are going to there before going to school) most of the children in those classes will be in their school.
hth