What we came up with is The SPAB Briefing. It is smaller than the A4 magazine (it’s 189mm x 267m) so it sits neatly under the masthead of the magazine when they are posted out together. It echoes the magazine is some respects (for example, the corporate red is used on both covers) but can easily be viewed as a standalone publication.
The first Briefing is out now and sample pages from it are shown below. The second issue is in progress and will be published in March.