Update
Guys Iv spoken to him, about the date and he said the date (year) thats a genuine mistake but the certificate when it arrives will have the correct date.
Regarding the 2.3 only thing he can possibly the boiler wasn't running at max and not using the service mode was his mistake but did...
Im gona give him a call, thanks for everyone for you feedbacks really appreciate.
And those who think I installed or made up or filled in the benchmark book; not sure what to say...i have children and if you too have children, you will understand will this is a very dangerous risk to take.
Guys im getting worried now...
Can I press some buttons on the boilar? And find the right figures
I live on a send floor flat, water pressure not good and flow rate not good either, thats why i wanted a 22mm dedicated mains water for the boiler. Not sure about the gas pressure