Hi, my contract doesn't state anything about changing roles thanks

Hi I've worked for the same company for 15 years as an office manager. There are 6 girls employed by the company in head office 4 office workers, 1 worker and 1 shop worker. We have always done the following Cuppa first thing in morning then more throughout the day, taking it in turns to make it. The smokers go out once an hour for a ciggie. We have a half hour for lunch. I agree that these are quite excessive however, it's been done forever. Now the boss has decided that we will have 3 cuppas at 10, 12 and 3 and the girls can smoke at the same time. (Fair enough). But the big thing is we are now being expected to clean the offices/shop/toilets, taking it in turn. My bug bear is that there are 6 girls and we are all being made to take turns in cleaning (I was never employed as a cleaner). Any advice please