How to fit a new kitchen sink waste and dual inlet appliance trap to connect up a washing machine and dishwasher.

I used these parts:

McAlpine Sink Waste and Overflow - Screwfix P/N 77838
https://www.screwfix.com/p/mcalpine-s...
£7.33 - Feb 2023

McAlpine Sink Trap with Twin Nozzles - Screwfix P/N 95241
https://www.screwfix.com/p/mcalpine-a...
£14.27 - Feb 2023

McAlpine Flexible Connector - Screwfix P/N 43713
https://www.screwfix.com/p/mcalpine-f...
£7.69 - Feb 2023