Fairey Battle L5343(?) at RAFM Hendon – Question

Hello!

While sorting photos taken during a visit at the RAFM at Hendon in February this year, I found the following photo. I have two questions:

a) I was not able to identify the exhibit in question right away. After some searching and comparing I BELIEVE it is Fairey Battle I L5343 – Can somebody confirm this?

b) The “structure” under the fuselage looks like a rearward-firing Lewis gun. After some research I found a forum contribution of “curlyboy” from September 2008: “I thought the hatch in the floor was originally for the Lewis belly gun, there was a pic in a recent aviation magazine of the gun position where the gun could be fired backwards with the bomb aimer hanging backwards from the hatch totally exposed to the air flow and with no protection from it or the enemy really.”

So – is L5343 really equipped with what “curlyboy” referred to? If so – was this a standard armament on the Battle or just a mod on some examples?

Thanks in advance for any help
Thomas

P.S. Sorry for the quality of the photo but I’m no “digital native” and had difficulties to decrease the file size….