Our male cat has been neutered about 7 months, he was done when young so did not learn anything before op, but he is still rampant with my calling queens. Anyone had this behaviour.

It's quite normal actually, especially with toms which had fully gone through puberty and knew what to do before being neutered.

I know of toms who also 'love' their human females rather too much, despite being neutered.

If your cat was entire for a while then he can't unlearn the behaviours that his hormones made him learn originally, so it's not surprising that he knows what to do and thinks that he wants to do it.

He won't be able to actually do anything about it though, and so it's pretty harmless if your queens aren't offended by his attention, but the biggest risk I can see is if he gets pasted by other (entire) toms answering the calling- he doesn't have the hormones to give him the muscle mass and testosterone-fuelled anger that the other toms will have and consequently he'll get thoroughly beaten up.

He is connecting as his latest conquest Pinkle is a screamer, so we are all sharing his joy!!