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No WW2 service records have been destroyed. Maybe you are thinking of the large quantity of WW1 Army records which were destroyed by fire during WW2.

I helped my Dad to obtain his RAF service record from the MoD a number of years ago, and although he enlisted a few years after WW2 I was surprised that it was just a typed summary as the original documents had been destroyed.  The covering letter from Air Command said this:

"Enclosed is a copy of your RAF Form 543 - Airman's Record of Service. Please note, the Form 543 was designed as a basic administrative aid to assist the personal administrators and it was not intended as a biographical document. 

All other documentation has been destroyed in accordance with the MOD's Document Retention Policy".

They were also unable to locate his medical records and again cited the document retention policies. 

Form 543 did give a summary of his unit and movements, but a lot of it looks like gibberish.  Fortunately Dad remembered exactly where he'd been and when, as otherwise I wouldn't have made head nor tail of much of it!

The only other information on FWR is what they have gleaned from general online sources (ie NOT from his actual service record, which they do not have access to). 

This information is:
Militia (which is taken from the image I pointed you to)
They were enlisted at Cardington.
They were not a member of the Air Training Corps.
They enlisted after November 1943.

The source for this 'extra' information is here: https://www.ab-ix.co.uk/pdfs/rfc_raf.pdf

Well that just goes to show what an extra pair of eyes can do!  Yes, I'm sure that must be the right person.

I'd looked and looked for further information but I think I must have been typing in my 'hoped for' forename, which wasn't John!

The various records offices etc don't generally provide the family history information for free, so it's likely that FindMyPast has an exclusive contract allowing them to publish the images.

I can't speak for Colin, but personally I don't believe that this (your) William is the grandson of Bartin Burton.

The existence of the removal order indicates that as well as being illiterate and a labourer (as you already pointed out) he was also receiving or at risk of needing parish relief.

Bartin's PCC will is available online and does mention a son John, but it seems to me that people have simply jumped on it without question or further investigation.  Good for you for not doing the same!