Big thank you to Jess Nick Brummie and everyone else who participated.
You have just saved me 150 quids. I was going to go through with it but you convinced me to do it myself. I'm going to get a bike pump and a tire pressure gauge and I will share my results. Hopefully no later than Sunday.
Here's another recommendation he gave me: change the shower hose to a larger shower hose. Which I did of course, silly me.
What???
Were you able to recognise the 15mm pipe from the video? Are you 100% sure Morco recommends 22mm and NOT 15mm?
He installed the pipes. If what you say is correct, I have reason to sue this guy, and I will.
Please confirm