The panic makers in CSE just trying to buy cheap, by spreading fear waves.
For a small market like CSE when SL don't even have GSP + at the moment this is not going to effect that much.
Also it could be a good thing for Sri Lanka as last time , when EU banned importing fish from SL to EU countries , UK was against it and they wanted to keep importing.
Similarly we can think about CIPA with India. it shows how dangerous it can be connecting to a big economic areas without much control of it.It can be very damaging to an economy, country .
UK pushed to this by things like, local small to medium businesses destroyed by cheaper goods from EU and cheap labour and uncontrolled immigrants from EU depressed wages for uk poorest. Longer term this going to be a good thing for UK and also for world economy.