Look at Q41 (mea 4000), from my information controlled airspace starts at fl245. Does filing at 4000 on Q41 means i'm on my own?
Not entirely sure what you mean by this comment but Q41 is Class A airspace from the Base FL35+ (between ORTAC and SAM)so at FL40 you would normally be speaking to London Control (Hurn Sector) on 129.425 aside from the part in the Solent CTA.