Would be interesting to know how employers view this, especially those outside the UK (or even, in?) - do they change their interview loops to compensate for this, e.g. no more whiteboard sessions etc. I remember hearing about the BCS back in my university days but since then they've never come up in my career. The ACM/IEEE orgs tend to come up, but only in the sense of membership and on the (extremely rare) occasion I've known people who are recognised as distinguished members https://awards.acm.org/distinguished-members/award-recipients