Springslade and Hazelslade are 2 differant lakes, I don`t know much about Hazelslade but I used to fish Springslade, it is just off the A34 near the cross roads for Cannock Chase and the Penkridge turn,
I have no idea who controlls it now, there where some lovely looking Carp in there to about 24lb and also some Chub which would give you screaming runs and take any size bait you put on,
It was a very nice and peaceful lake, round like a Goldfish bowl, as far as I can gather it is not hard to join,
Pop into the tackle shop in Penkridge, the guy who runs it is very friendly and helpful, he will put you in touch,
I believe Hazelslade is a "just turn up and fish" lake, just ask anyone who is fishing,