looking for mirrors to be mounted to the windscreen frame for my buggy any suggestions would be appreciated 

Do you have the old style gp frame or a manx type with the channel, motor bike mirrors or firm like Europa spares and Car builder Solutions.
from manx frames you can buy mtg clamps to fit mirrors onto

Hi I have the old style GP frame. Any suggestions would be appreciated these are for my Kombat Buggy.

You will need an L bracket on the screen frame for most to bolt into https://www.carbuilder.com/uk/car-mirrors#/pageSize=20&viewMode=grid&orderBy=15

I fitted https://www.carbuilder.com/uk/universal-mirrors-black-lightweight- to my LWB GP buggy

Just found these and they have clamps the correct way for the traditional uk buggy flat screen surround. https://www.bowerspartsonline.co.uk/classic-car-parts/classic-car-mirrors/3-inch-clamp-on-stainless-steel-round-overtaking-peep-quarter-light-door-mirror-offside-only

Not brought and tried but the slot is the first I have seen the right way.