Problem solved - lithium battery was all it needed.
3 different screwdriver heads to take apart - a wee bit tricky when your hands are not as steady as they once were.
Better than yesterday - sheared the head off a screw when putting a new fan in the central heating boiler. No fault really with the boiler - age, heat etc must have taken its toll.
Drilled out and a slightly bigger bolt & all is well. £80 & about 1 hour + perspiration rather than quote of £140 + 1 hour + VAT = £240 ish.
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