I did wonder if this was his parent's marriage, also off FreeBMD, altho as Chris says maybe not given Collier mother's name ??

Surname First name(s) Mother/Age District Vol Page
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Marriages Sep 1911 (>99%)
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Collier Thomas Kington 6a 1183
DAVIES Mary J Kington 6a 1183
Pearson John H Kington 6a 1183
Tristram Caroline E Kington 6a 1183

Need to try and find out where these people go and who married who?. However I wonder if you've already been down this route judging by your post ?
How do you know he was orphaned, no more clues at all there presumably ?.
Unfortunately none of these names are at all uncommmon, so..

?????

Have you tried the Herefordshire Archives / Record Office ?
https://beta.herefordshire.gov.uk/leisure-and-culture/local-history-and-heritage/family...

A bit off our patch!

There is this birth reg on FreeBMD:

Births Mar 1914
COLLIER Thomas Collier Kington 6a 898

Mother's Maiden Name also Collier so likely to be illegitimate I'm afraid.

You can purchase a copy of the Birth Certificate from the GRO:

http://www.gro.gov.uk/gro/content/certificates/

They cost £9.25 and usually arrive within 7 days.