Over my operational years, back in the days when EFPS and the like was just a dream (perhaps rather like Blade Runner), every unit I worked at had at least one bespoke strip design to suit local activities. The MATS 1 use of different boxes on 'standard' strips also often varied in some details.
The example shown rings bells from one unit which, I think, used them in approach for arrivals, and if my memory serves were, rather strangely, pink. It's all a long time ago now and my memory may be failing me a bit!