Please help! funny white dots!

[will1113_cg]

I am at the beginning of creating a render and i have done a quick trial. Could somebody please explain the funny white dots appearing in my render, i have used these setting loads of times and they have never appeared before. Settings are:

Reinhard(burn0.8 & clamp/subpixel - ticked)
QMC Sampler - noise - 0.005 adaptive amount - 0.85
Irridancemap -3-0 & lighcahce - 1000

Thank you very much