As far as good *locations* are concerned (as opposed to *events* - don't know about those) for the Sunrise, I'd possibly choose one of the less commercial East Coast towns like Frinton on the Naze, or Holland on Sea and watch the Sun first ray's first hitting England, literally breaking into day, over the waters horizon.

Otherwise, the Iron-Age fort at Wandlebury is a place of interest and history in Cambridge. While not dramatic, has a real 'feel' to it (IMO) - an hours drive. I believe there are sunrise Morris on May Day here.

The hill at Wormingford also has something strangely atmospheric about it and a good spot to catch dawn breaking - chilly though. Here be Dragons! It's supposed to be coiled around the hill...