I WOULD LIKE TO CHANGE THE TAPS ON THE BASIN IN OUR DOWNSTAIRS TOILET, BUT THE OLD ONES HAVE A REALLY SHORT THREAD. I WAS TOLD BY THE PREVIOUS OWNER THAT THE PLUMBER DID THIS TO KEEP UNSIGHLTY PIPEWORK OUT OF VIEW. I HAVE MEASURED THE THREADS ON 4 OR 5 DIFFERENT TAPS IN B&Q AND THEY ALL SEEM TO BE 50MM. IS THIS A STANDARD SIZE. THE THREADS ON THE OLD ONES ARE ABOUT 30MM. HOW WOULD I GET THE NEW ONES TO FIT WITHOUT HAVING TO ALTER PIPEWORK. I WOULD CUT THE THREAD BUT WORRY THAT I WON'T BE ABLE TO THREAD ON THE COMPRESSION FITTING THUS WASTING A PAIR OF TAPS. IS THERE A CERTAIN WAY OF DOING IT. THIS IS MY VERY FIRST POST AND WOULD APPRECIATE ANY HELP. THANKS!