One from Allan L's archives:11.9 Phoenix engines on test

[Allan L]

I am guessing a Lanchester. They were known for horizontal opposed engines. At first two cylinder later four. That would make the picture about The late teens.

otto

As I wrote before, these are not horizontally opposed engines.
Late teens would be about right, however.

Off thread, Lanchester twin-cylinder opposed engines had been superceded by the in-line four-cylinder 20 h.p. by late 1904

[GRAYWOLF]

Renault?

[Allan L]

Renault?

No

I recommend you read what has been asked, and the answers I've given!
Oh, and look up where I live . . .

[GRAYWOLF]

I didn't know if maybe they may have imported some engines at some time...

[Allan L]

Still here!
Time to let it rise from the ashes.

[Allan L]

Still here!
Time to let it rise from the ashes.

Still here: how much of a clue do you lot need then?? 

[max]

I'd buy a salamander or a phoenix, but do a wyvern's flames have by-products of any sort?  Closest to North Herts I can think of is the Vauxhall Iron Works.

[Allan L]

I'd buy a salamander or a phoenix, but do a wyvern's flames have by-products of any sort?  Closest to North Herts I can think of is the Vauxhall Iron Works.

Not the Iron Works (aka Bedfordshire's branch of Generous Mo'ers), but the above is closer than you may think.
The company involved closed in the mid-1920s

[max]

If at first you don't succeed.........
http://lgcs.amolad.net/phoenix.htm

[Allan L]

If at first you don't succeed.........
http://lgcs.amolad.net/phoenix.htm

Well done, though it has taken a lot of clues/hints for the combined talents of Autopuzzles to get there.
They are Phoenix 11.9 engines on test in the Phoenix works at Letchworth, either just before or just after the Great War.
Here is the Managing Director in one of his cars: