Thanks for a welcome
Grays is right on the river, with a wharf that would have been busy with coastal vessels like colliers circa 1910.
It is on the estuary approach to London, the busiest port in the world at the time. Quite likely boats based at Greys would meet large ocean going vessels, carrying out pilots and customs officers.
But - look at this Royal Navy junior officer for a very similar style, with the lapel buttons
http://www.alamy.com/stock-photo-royal-navy-sailor-of-the-late-victorian-or-edwardian-period-in-uniform-50489902.html(the white cap cover is removable)
The blurry buttons and cap badge in that photo don't seem to match yours, but there is room for doubt.
If they don't match RN, who would use similar pattern tunics?
Customs cap badge most obvious feature is a portcullis grill, although that is topped off by a crown and usually set in a bowl of laurel leaves.
Similar uniforms
http://www.mycetes.co.uk/a/page152.htmlUK lighthouses are run by Trinity House, a kind of trust, that does not use a crown badge. There were lighthouses and lightships at work on the Thames estuary, and supply boats to service them. One old
lightship was beached at Grays, suggesting it was some kind of home for T.H. Plus there is a building named T.H in Grays which may once.. etc. (HQ is in London)
But note that Pilots (and pilot cutters) are Trinity House as well.
https://trinityhousehistory.wordpress.com/2013/03/28/trinity-house-pilotage-service-in-the-1890s/The cap badge is sort of bowl of laurel leaves around an anchor, topped with a lion, which might resemble a crown.
http://www.mycetes.co.uk/a/image456.jpgI might well be waay off here, but that uniform is neither copper nor postman nor railwayman. Concievably any kind of shipping or naval operation.
Civilian shipping companies at the time would use elaborate heraldry for cap badges etc., but a crown is something official. Matching buttons is upmarket, but does not exclude civvy shipping.
Railway companies, always fond of uniforms and fancy buttons, did also operate ferry services, and nautical style uniforms would be used here. But you can almost always read their initials somewhere, e.g. LSWR
Need to see more of the cap and buttons!!