Tiny white beatles in multipurpose compost.....

[kippers garden]

I sowed some seeds yesterday in a clean margarine tub and they are in my propagator on my windowsill.  I checked them today and have seen one or two really tiny (approx 1mm) things crawling in and out of the compost...should i be worried?...what are they?...i thought my compost was sterile so where have they come from?

Any advice welcome thanks

[kippers garden]

[saddad]

 :o Don't know what they are but...  :o