So it's time to replace the kitchen as various appliances have or are dying. I am removing the old kitchen and I have come up against two issues which I'm wondering if the panel can advise... House is 2002 and the kitchen I am removing is the original. So firstly, I have discovered in the corner, a fairly sizeable hole which there is a slight breeze from so I guess it plunges into the foundations (I can see breeze blocks below the hole). This has been there all the time but is no more visible since removing two wooden batons from within which two pipes will be going. Should this be left alone for reasons of air flow / drying or would it be best filled with expanding foam or similar? Secondly, I am removing ceramic floor tiles and these are easy. However, the tile cement (I presume it is) underneath is a tough one to remove and with a bolster chisel and sizeable hammer, it took literally 5 to 10 minutes to remove basically a quarter of a tile size, and the floor is still slightly uneven in places even then. So my options are: carry on and regret it later, hire something which will do it mechanically, but what? or a screed over the top, but this will mean hall into kitchen is slightly raised, albeit no the end of the world but annoying. I've attached two pictures showing each situation. I thank you.