Hi Ellen SJ,
I’ve personally had no problem with the sink or tap. Depending which type depends on how you tackle it.
If it’s the earlier type, it has four screws, one on each corner of the sink, covered with little black or grey decorative caps. Flick these off with the point of a knife, undo the screws under them and you will be able to lift off the sink complete. You may have to disconnect the sink waste first from underneath – I don’t know as I’ve not done this before so proceed with caution.
With the sink lifted and waste disconnected (you may not have to disconnect it, depending upon how much ”slack” there is in the pipework). You will now be able to get access to the red and blue pipes (hot and cold) under the tap and investigate where the leak is and why it is leaking.
If (and I repeat “if”) the tap is the same kind as the washroom one, there is a small pin, inserted in a tiny hole under the tap, that holds the pipes in. Push this pin out and the pipes will be released. I repeat that I’ve not done this before on the kitchen tap and I’m only giving this info in an attempt to help you, so proceed with caution and be prepared for it not to be the same.
There may also be a large, probably plastic, nut underneath that may release the tap if unscrewed.
If you have the newer type of sink unit, I’m afraid I can’t help you – I’m just not that familiar with new one.
Someone else on here may be able to help you though.
Good luck with this and as ever, let us know how you resolve it, as a help to others in the future. Thanks
Barry