We provide diamond drills for this purpose.
A lot of our product is used for example on ceramic sinks, armatage shanks, and all sorts of appliances where you need to drill out areas to widen them.
In fact a lot of suppliers of bathroom furniture leave it to the customer to drill the hole.
In this instance we can provide you with a diamond drill to open out the loo pan. And we guarantee the work.
Richard
Website.
Drilling hard porcelain wall tiles with 365 drills diamond holesaws granite cutting marble floors