Can anyone help me find out more about this Fighter Pilot?

Hi all,
It cropped up in conversation with my cousins partner yesterday that his late Grandfather was a Fighter Pilot in WW2. Of course, immediately interested i started throwing questions at him to try and discover more. However, he himself has had trouble in finding much about his grandfather and could only provide the limited information he knew. He gladly accepted my offer of investigating further for him and I recommended first posting here on this forum as they are “all such nice chaps who know absolutely bloody everything!”

The man in question was a George Allyson Thomas. (We are unsure about the correct spelling of his second name.) At the moment his birth date is unclear, but he unfortunately passed on just under two years ago.

It is known that he operated from RAF Hibaldstow, Lincs, which upon minimal googling returned this:

Taken from http://www.brigglife.co.uk/hibaldstow.htm

RAF Hibaldstow
RAF Hibaldstow was built as a satellite airfield for RAF Kirton Lindsey in 1941. The land – owned by Alfred and Harry Pawson, John Day, Arthur Borrill and Harry Ellis – was a rabbit warren. When the runways were constructed, some of the hardcore was made from material taken from demolished bungalows on the site.

The airfield was commissioned on 12 May 1941 when 255 Squadron took up residence with their Defiant Night Fighters. These planes had been drawn from RAF Kirton Lindsey and made one ‘kill’: an HE111 which was shot down near Louth on 5 June 1941.

In June 1941 the Defiants were replaced by Beaufighter IIs and on 23 September 1941 253 (Hyderabad) Squadron from Skeabrea, Orkney arrived. In addition Havocs from Hunsden, Hertfordshire also came to the base.

By the start of 1943, the low risk of night attacks by the Luftwaffe lead to the closure of the airbase (23 January 1943). The airbase re-opened on 9 May 1943 for 53 OTU and once again closed on 15 May 1945. Shortly before closure WAAF Margaret Horton had an ‘unexpected ride on the tail of a Spitfire’ – which is written up elsewhere.

On 6 August 1947 the station finally closed and during 1960-61 it was sold off for use as agricultural land. It was also used for Sunday markets, as a skid-pan by Lincolnshire Police and by a local parachute club. The control tower was converted to a two storey house in 1976.

It is interesting to read that this was the place where WAAF Margaret Horton had here ‘ride’ on the back of a Spitfire. His Grandfather had apparently told the story a few times from a first hand account, as it was a good friend of his that was piloting said aircraft!

My cousins partner recalls seeing some wartime photos of his Grandfather in or next to his aircraft of the time which clearly show the squadron codes, but these are inaccesable at the moment due to his father (the custodian of the prints) being currently on holiday.
What we do know is that the aircraft is of single engined variety and from the short history found above we can narrow this down to either a Defiant, or perhaps an OTU Spitfire?

If anyone can help me find out more about this pilot i’m sure the family would be eternally grateful. Thanks in advance.