Thanks guys for all the input - one thing’s for sure, the prices do seem all over the place 
Forgive me if I forget anybody out, @fixeighted 's pricing seems to be where I believe the accepted quote would be floating around - it’s a complete guess, but it seems @fixeighted has a good grasp of what these types of client are after - they’re not looking for top notch work, they see you as a commodity and it’s about their bottom line.
I still can’t get over @Sean’s ability to knock this out in a day, that’s simply crazy (ie amazing - if it’s possible)…
@Pixelcon 's price, of €3k I totally get his position re his standards, quality, treating this customer like any other - I respect that.
@glorybound , Bobby’s price doesn’t surprise me, it’s what I would imagine and seems very reasonable considering the quality and experience you’re getting, seeing as this is Bobby’s bread and butter…
So… what was my price?
£1750.
I did make the assumption that there are areas which are not on the drawing that I know would need to be created and maybe that was my mistake in including them (eg, no patios, paths, foliage, planting, downpipes, no ridge tiles, hip tiles etc etc… really?). If I’d have quoted without any of those it would have gotten things down to circa £1500-1600 which I believe would still be nowhere near the eventual ‘winner’'.
I still wouldn’t have gotten it.
I do tend to think that there’s more that’d be needed than what is on those plans and maybe a call with the client first would have been a good idea. However, I still think he’d end up going for someone around the £900 mark and I’m simply out of that (maybe there are those out there using SketchUp or Twinmotion that can knock these out very, very quickly).
Once again guys, thanks for your input - shame I’m not really in 3D anymore, I love the community, but pricing has always been my downfall and too many experiences like this one wore me out eventually…