New build upstairs pipework order of & markings

[Roger44]

Hi All,

Currently doing a new build that has underfloor heating downstairs and radiators upstairs. From the image provided can anyone tell me in order from left to right what each one of these pipes does by the way the plumber has marked them with tape. Thanks.

 

[SimonG]

That underfloor pipework spacing doesn't look right. Looks too wide.

 

[SimonG]

Unvented cylinder for hot water?

15mm should be ok for baths but depends on water flow rates.