Went to Rickmansworth School and grew up in nearby Watford. Ricky / Croxley perfectly nice places to live to settle with the family. Ricky is a bit posher and I imagine prices are a bit more.
Riding wise, you have Whippendale woods near Casiobury park they are quite small, you can do a lap of all the good trails in about 40 mins so fine for a quick blast but not for an epic.
Chilterns is not too far away and will open you up to longer rides but elevation is not great and trails are easy woodland trails but there are some nice views to be had.
You have Aston hill about an 1 hours drive north for DH and Woburn also about 1 hour away for some more fun XC trails and also park riding. Surry Hills are about 1.20 mins away too.