Tap, tap...

I think things appear to be restored - at least of the ones I've tried. I had to add execute permissions to some files in /etc/init.d and reinstall some zapped files from the appropriate rpm, at least most of them appeared to be the same as in the original install (and not the subject of a security related upgrade). I used

rpm --upgrade --force

a fair bit, probably a blunt instrument but I appear to be unscathed. Web server is now back and running!