I have just completed a trip from the UK to Belgium (and return). SD flight plan submission worked very well on both occasions.
I also successfully added an extra required address (due to the French closed BRIA offices).

However I noticed that my outbound FPL to Belgium had more listed FPL addresses than the equivalent for my return back. Is this normal?
For leaving the UK, the e-mailed confirmation of FPL contained these addresses:
EGKHZTZX EGZYVFRT LFFFZFZX EBBUZFZX EBBRZPZX EBKTZTZX EBSZZRZX LFBDZPZX

For the return only these were listed:
EBBRZPZX LFBDZPZX

LFBDZPZX was the address I added, so for my return flight the only address SD created was EBBRZPZX.
I am surprised that no addresses for UK were included but perhaps the Belgian FPL processing system takes care of that?
Tony Nowak