I grew up in that area in the 1960s and would certainly have known about it had it been anywhere near Beachy Head. I think, though, that wreckage of an Me 109 at Kentwins, Nutfield, Surrey, was found during the laying of a pipeline - but I could be wrong! From memory, I think the incident was on 30 September 1940?
As for Schmitter and Hainzinger - no connection! No pipelines anywhere near there and my article 'A Far From Ordinary Pond' in Britain at War Magazine tells the full story. Details of the edition here:
https://secure.hosts.co.uk/~alliance...hp?issue_id=21