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Perhaps it was a US DTMF-only version for evaluation, then the GPO brought out an LD version for UK use?
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Possibly, but I suspect it was about DTMF signalling itself, as much as the dallier, as this was years before the exchange was modernised, and a converter had to be installed on the MDF. Perhaps they selected subscribers with various line-lengths for the trial?
Whatever it was, the styling was very similar to the one pictured,