I have now bought 3 lenses (Nikkor 55mm,16-35mm,24-120mm), a camera body (Nikon D750) and flash unit (SB700DX) from HDEW over the period January 2015-August 2016.
The number of times I have been back to them shows my confidence.
They have, in all cases, been very helpful, available on the phone and delivered promptly. Their prices are good and their excellent guarantee covers any deficiencies which may result from their sourcing. (Not that I've had cause to call upon the guarantee as all the goods have been fine.)
A trustworthy low-price seller.