If by full bore stopcock you mean the one that comes into the kitchen then I
have one.
Yes my kitchen tap is different, well the hot one anyway, its slow sending
the water out.
Thanks

As a matter of course, meter or not, you should have a full bore stop
cock.
If one is not there, get one. The new installation may be disturbed slime
and debris in the pipework and crap has lodged itself around the water
system. Does the kitchen tap appear any different?