UK Fly Fishing

I am visiting my mother in England. Upon arrival, I immediately regretted my decision to leave my fly tackle at home. As it turns out, there is a stream three and a half miles from here that holds brown trout: the River Lee (depicted in this 19th century oil painting). I am awaiting a 5-weight fly rod my mother ordered for me for my birthday. I have managed to put together a small box of flies and secured a pair of wading boots from a local tackle shop. Most importantly, I have found publicly accessible water on the River Lee just below Wheathamstead, which is one of the villages near by. I don't know if this stretch holds decent numbers of browns. According to the net it holds "chub, dace, and barbel" which are all similar to both our North American fallfish and carp. I know that the River Lee is generally known to hold browns and I know trout fishermen are prone to hold secrets. The rod should come tomorrow which leave me about four days to fish. Wish me luck.