I have always avoided Tittesworth Reservoir as an attraction. Why would I want to visit a big lake of water constructed in the 1960s?
Actually though, there is a fascinating walk around the perimeter of the water, and it's wooded and contoured so is more interesting than you'd think. Plus it does have a previous Victorian history which is evident in some of the older parts.
In the 1990s they built a Visitor Centre and expanded all the conservation work there.
I'm a convert now.