Leak Stereo 20 - Continuity between Chassis and Binding Posts?

I fitted some WBT binding posts to my Leak amp this afternoon (I'm now not even sure I like them in the place of the perfectly fine Maplin branded b/posts formerly fitted) :facepalm:

After the job was done, something made me check continuity between the posts and chassis and there is - between all 4 posts and between chassis.

Before I switch on and blow up my amp, is this continuity situation correct?

Thanks

mafioso