Checked already with Host, but they say there is no restriction on mod_rewrite and they cannot provide assistance with programming etc.

I really do not get this, the real URL could be:
http://www.domain.com/services.php?id=consultancy
so the given entry as:
RewriteRule ^/services/[a-zA-Z0-9.-]$ /services.php?id=$1 [L]

should really take care of it. It does not. I also tried on different server (with different host) and on local machine. Not any better... Why could that be?

Son