Long Final:
If you are departing from/arriving at a non-customs UK airfield, your flight and people details need to be notified 12 hours in advance to both customs (who are acting as agents for immigration) and special branch. The same information is required by both:
Names of UK & Foreign departure and arrival airfields
A/c reg; where based; type; owner/operator
ETD (UK); ETA (UK); routing if any intermediate landing
Whether or not you are claiming fueld drawback
For all people on board:
Name; dob; passport no; nationality; travelling out/in/both
This information should be faxed to the National Coordination Unit (Customs) 0870 240 3738.
For Cambs the special branch fax number is 01223 823295.
This info is based on what I do (departing usually from Bourn). If you have on board any non-EU nationals, I would take further advice. Also if returining from a non-EU destination.
If you change your return plans, you should also fax the details. I ghave found this difficult, so have phoned the changes (even at short notice):
Customs 0870 785 3600
Cambridge Special Branch 01223 356590.
You may find customs or special branch meet your return flight. This has happened to me once only.
At Le Touquet, try to go through immigration and customs, but don't be surprised if there is no one there. (If you go to Belgium, you will find they take immigration more seriously).
Don't forget your aircraft docs, licence and photo-id.
Hope this helps.