I want to replace an old slim plastic cistern with something similar. The existing one is a push button one with bottom fill and bottom overflow but I can't find a direct replacement. wickes do a slim plastic one for £22.00 which sounds good but is side fill and side over flow although the info on the wickes website says it can be made into a bottom fill with additional items. I went into my local wickes today to ask what was required but they didn't seem to have a clue. Has anyone any experience with this cistern and know what is required - I know I could re plumb for side fill but there is not much room.