Nothing to do with your photos. I asked the biker how he can state that there is subsidence from those limited photos, and how he could state that there is subsidence in the absence of no internal cracking in the same place as any external cracks - which is indicative of foundation movement (aka subsidence).
Oh ok, sorry. Where the crack is below the window there's a big radiator on the other side and wallpapered around so it's hard to tell if they are on the inside too. I think there are some but I don't think they follow the same pattern. There's so many hairline cracks in this house we haven't really been taking notice when decorating etc.
What's the best thing to do now?