I live in a flat and I do have just one fob key and I need a nother cos mum sometime comes and stayes when I do need help in cleaning or other house work

I will be very pleased if somebody can help or tell me any address where can a do a copy of this key which is fob

You ask the council.

I did they won't give me they say they just provide one and if this is lost they will give me another but they will cancel the last one so I need to know if I can find a place to copy it private

These fobs can't be copied, that's the whole point of them.
I would suggest going back to the council and explain the situation.

Don't get shirty with them as they will simply say no.

Sorry to hear, I don't see a reason they can't provide a second key, for a small cost, They cost about $3.00.
Each FOB has its own identification, and would actually help THEM if you each had a FOB, this way, they would know which of you is entering or leaving, If they are that nosey.
Is this a 1 person? Flat? Having 2 FOBS would allow a second tenant?
I see many Companies/People being a JERK, just because they can?
Good Luck