I challenge anyone to disconnect the water feed, remove the top part of the siphon, remove the likely rusted manky bolts holding the cistern, remove the bottom part of the siphon, clean the whole lot up where the foam ring has turned to mush, remove the old filler mechanism, replace it, plus the siphon, bolt the cistern back to the toilet, reconnect water supply, adjust fill height of both the siphon and the filler, then install the push button and test. Then clean up behind yourself

In ten minutes 😂

Bear in mind the guy you’re speaking to is a yank and their plumbing makes the fucking Roman bathhouses look modern lmao