Roofer/ builder recommendations - Leeds

[Ali_GTS]

I have a flat roofed side bit to my house where the downstairs loo and a small shed type room are located and the flat roof has seen better days. I did have the felt etc recovered about 10 years ago but now that big chunks are falling out at the edges of the roof it seems a good time to get it sorted.
Can anyone recommend a builder or roofer who could come in, take the old structure down and put in something with a bit of a pitch? Rubbish pic to show you what I’m probably describing v badly!