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Similar design is a Ugreen Nexode 45 watt charger[0]. Folding prongs, May be ever so slightly larger. I just purchased one for an upcoming trip.

My Apple 20W UK charger measures 49 × 45 × 30 mm, making it much smaller than this Ugreen one (50 x 50 x 42 mm).

I'm guessing an Apple 40-60W UK version might come in somewhere in between in size?

There's also the Anker Nano 45W, at 49 × 49 × 34 mm: https://www.amazon.co.uk/dp/B0DPR2VYQF