have a kitchen mixer (Bristan I think) installed abt 5yrs ago.
recently cold water flow has been reducing (hot fine 3bar!). This
morning cold is only a trickle - hot still fine.....

(both h&c supplied by a 3bar pump, rest of house unaffected)

Had a quick google most 1/4 turn queries are about dripping etc -
anyone had this low/no flow prob before? any pointers where I'm
heading? new cartridge? something else?

thanks for any tips
JimK