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I wonder if that might actually be a medium term solution - plumber's due to come service my boiler soon, so he might be able to rig something up under the sink so that I can connect a hose/karcher that way...
@Sam_w thanks - looks from this video that a big bucket would probably work for this model https://youtu.be/yhGlOq_x0f4?t=225
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I think hozelock do a brass fitting that will screw into a tap if it's threaded internally. Alternatively you might look at modifying one of these - I 'carved' the yellow plastic window with a dremel to allow it to fit over a chunky vola style tap. Cant see why this wouldn't work especially if you remove the tap lever section first. Fugly mind ;-)
This is a DIY question if the answer becomes install an extra tape with a screw fitting under the kitchen sink.