Thanks for the responses, guys.
Yes, I have taken the spout off of the tap body, but there is nothing internal that can be removed at either end. These taps are connected using flexible hoses. Do you think there is any likelihood that these could contract slightly over time, thus affecting flowrates? It seems a bit coincidental that this would happen on both hoses together, I suppose. When I check again I will look for any gunk but, again, it seems unlikely that it should affect both supplies.
By the way, there have been some occasional works going on recently to the water pipes around these atreets but, as I said earlier, no other appliance in the flat has been affected. Also the hot water comes from a cylinder.
Furthermore, it is a bit of a palaver to remove the entire tap body from the sink as the kitchen unit’s rear board sits in front of the area below the taps. No doubt a part of this will have to be removed in due course.
Cheers, guys.