On that Mickjoebill - to be fair this one looks like it was properly planned:-
http://www.aaib.gov.uk/cms_resources...pdf_502261.pdf
Yet it went wrong. The AAIB report doesn't indicate why it went wrong or the process that led to the pilot not seeing the wires, yet he stated he specifically chose that part of the river inc. exemption from the CAA.
Is the recce for these things physical or via a google earth or similar??