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Hovis-
Didn't look far, I know there is a 100mm version but if it is sold here is another thing.
Bit of a bodge: https://www.drainageshop.co.uk/category-6066/80100mm-land-drain-junction.html
lynx
100mm is older cast iron soil pipe width in France and I bougt a 100mm to 40 adaptor. Would something like this work
https://www.drainageshop.co.uk/110mm-drainage-pipe-fittings/P-RX417BL.html?kw=&fl=1000&ci=71690518203&network=g&pm=&cid=336473163&aid=19994770083&tid=pla-154546143123&dev=c&mt=&lim=&lpm=9046003&pos=1o17&dm=&fid=&mid=104842450&pid=P-RX417BL&country=GB&source=google