they cannot fit a water meter without you agreeing, trust me ive been through it all this year after someone dobbed me in to anglian water,
Its been in the water supply regulations for years that you cannot connect a pump drawing more than 12ltrs per minute directly from a mains supply, so apart from the water meter part the rules you mention are already in place and have been since 1999 I think
Don't forget to include your waste in the calculation a pumped 4040 would be getting near it.