Seeking... A plumber who has experience fitting toilets and can cope with iron pipes

If anyone has good experience with a plumber who has a track record of replacing toilets, isn't fazed by 50s plumbing, and isn't booked up for the next three months, please please recommend them to us! Had lots of quotes, none of em suitable or available, one of them has left us with a leak that we didn't even have before he tinkered... Need your help HoL!