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Hello. I am hoping to contract someone in Germany to provide some professional help in dealing with the state archives and church records in Lower Saxony (eg Das Niedersächsische Landesarchiv). The location/period I am looking at is in Lautenthal, then in the Kingdom of Hannover, before 1858. I would be grateful for any pointers on where to start in finding someone reputable. Thank you.

As Gerry alludes, you should clarify whether you believe he was in the Royal Air Force (RAF) or Royal Australian Air Force (RAAF). If it was the RAF, you would be looking at British service records (perhaps the resources listed or a post on http://www.rootschat.com/forum/armed-forces/ could help there). While there was a heavy British presence at the Maralinga test sites, I don't think it out of the question there was also British involvement at the Woomera rocket range. With either RAF or RAAF, I think the applicable service records are a good avenue to pursue. Re the RAAF, contact the National Archives of Australia, see http://www.naa.gov.au/collection/fact-sheets/fs32.aspx.

Slightly off-topic -  it will be tricky for genealogists in the future to track down some registrations, particularly marriages, with so many 'destination weddings'.  We have attended family weddings on a Greek island and in Fiji.
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[Editted] If it was only a celebrant ceremony, unless they civil registered the marriage in the foreign country, wouldn't they still have to register the marriage in their state or territory on return?

As a UK site, it is now subject to the EU's General Data Protection Regulation 2016/679 (GDPR), so all living people are private, unless they expressly indicate not to be (ie through being a site contributor). Quite strictly complied with on WT.

Thank you