In article ,
"Christian McArdle" writes:

Whilst a repair should be fairly simple, so is replacing the cistern. I'd be
tempted to do the job properly right away if you can get hold of a
compatible cistern. There shouldn't be any need to replace the business end,
unless you had your heart set on a change of style.

I don't think you can buy more than a 6l flush nowadays,
and that won't clear a 30 year old pan designed for a
9l flush. In some designs, you might be able to increase
it slightly by raising the fill level and blocking the
syphon air inlet.

--
Andrew Gabriel