Welcome to the Forum.
Not an easy job, this one. He Enlisted (546798) sometime shortly after Oct 1939. That number does not come up (for me) in the LG, so it seems he was never Commissioned, or got a gong or MiD. He doesn't come up in CWGC - so it seems he survived the War.
I tried to find him in TNA AIR 78/1 (as Ross has suggested) in order to try to get Forenames, but even though I used two separate computers the TNA would not play ball with me. Don't know if anyone is getting the same problems (pages of "SAMPLE" in stead of data). The Forenames would enable one to find place/date of Birth Registration (ditto Marriage/Death).
However, looking at the BT Residential Fone numbers in the Harwich/Dovercourt/Felixstowe areas shows one Ablitt still there (there was, at one time, quite a 'nest' of Ablitt's thereabouts). You might have to risk a 'cold call' to the number!! (Or write to the address) The least that can happen is that you will be told to go forth and multiply - but in our pursuit of Met Casualties we've had some limited success with this method.
Not a lot to go on, I'm afraid - but better than a kick in the teeth. Somebody, somewhere, knows of this guy - it's just a question of tapping on the right bit of woodwork!!
Meteorology is a science; good meteorology is an art