for no apperant reason my avatar has disappeared from this site,Why?
Correct. Have checked your profile and it isn’t there.
We certainly do not have a policy of removing/blocking them (unless offensive, etc, when we would certainly inform someone of the fact). It certainly hasn’t been done from our end.
Try re-instating it.
■■■■ computers. 
Mine went ages ago and I couldn’t be bothered sorting it all over again… 
panic over.picture of my dog is back.