Hate to be pedantic but that's a Vickers Warwick not a Wellington. Only the Warwick flew with the airborne lifeboat. Great pic, though. Always liked the Warwick.
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The one in question is a Wellington Type 216 which, as Jim noted has a turreted 40mm and also Merlin engines. It might be "L4250". Still looking for another photo
Found another photo in the Warpaint book showing the aircraft in profile and showing the supports much clearer with the caption "Because of severe tail vibrations caused by the turret the prototype Vickers gun version was rebuilt to have twin tails and rudders. The gun was fired during trials but the project was discontinued. (IWM)"
My favourite Wellington is the double torpedo strike variant.
These would have been great out of Singapore or Ceylon. With Bomber/Coastal Command's best navigators on the job, imagine a night torpedo attack on Nagumo from these.