Hi,
I have a problem with slow filling on a dualflush cistern, however if I run the bath tap for a few seconds after flushing then turn off the bath tap it goes back to normal speed for filling. I hope you can understand what I'm trying to say.

I thought maybe it was a problem inside the lid but for the life of me I cannot get the lid off, I managed to get both the buttons off but cannot see a screw or anything else that would enable me to get the lid off. Help please?

Show us a pic.

How do I get the lid off a venus toilet suite

how do i get the lid off a venus toilet suite
Ya got to be more specific then that. Explain your problem in detail ,(a picture would be nice.)
Here's a picture of a Venus toilet tank. It doesn't show a lock on the lid.
For more information go to. http://www.plumbingsupply.com/ur-toiletrepairparts-new-venus.html Good luck, Tom