Thank you all so much, lots of useful advice. I now know what I have to do. There will be 2 of them and they are doing all hoovering, mopping with disinfectant, dusting and polishing, bleaching of bathroom, kitchen cupboard doors outside, moving small appliances to clean under, fan, hob, worktops all surfaces, tables, chairs, moving of furniture, cleaning skirting boards, internal doors/door handles/switches, all inside windows and much more in-between. Thankfully, it is a small home and they will have 3 hours for 2 of them to get round it. I just need to tidy my study - everything else is reasonably organised and clear. Thanks again! 