The reliable way to hire a tradesperson

Our BTL property was provided with EICR certificate five years ago. Now on renewal , another engineer pointed some things (like gourmet not in place) and failed asking for £200 to do the work and issue certificate. My question is, was then the previous engineer who gave clear EICR was wrong or the current engineer is just making things up to charge us more?

I've been told by a tradesman that the ridge tiles on my roof need repointing. The roof is about 10 years old. How do I know if this work is really needed?

I’m looking for some advice from experienced roofers. I’m building a single-storey rear extension and I’ve run into a roof pitch issue. Due to the existing first-floor windows and the maximum permitted roof height, the steepest pitch I can realistically achieve is around 10° (12.5° would be extremely difficult). I was originally planning on using roof tiles, but I know 10° is below the minimum pitch for most tiled roofs. What would you do in this situation? * Would you use a low-pitch tile system, and if so which manufacturer/system would you recommend? * Or would you switch to something like standing seam metal, EPDM, or GRP? * Has anyone successfully built a tiled roof at 10° that has remained watertight long-term? * If you were quoting this job, what would you recommend as the best long-term solution? I’d like to keep the appearance of a tiled roof if possible, but reliability is more important. Thanks in advance for any advice or photos of similar projects.