Many thanks C-W-S, unfortunately GVA doesn't work as I'm looking to avail of the ex-Germany > Hong Kong fares which BA are pushing at the moment and they jump quite a bit for AMS, GVA and DUB.
The DUS 5.35pm flight out of LHR looks reasonable for B2B timings alright. I just am a little spoilt with LCY on my doorstep!
Thanks!
Pilot37