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I have a relative who was the pilot of a Halifax which came down in Normandy in July 1944.  His crew parachuted out several miles before, two were killed and the remainder became POWs.  My relative was reburied in an official cemetery on 4/3/46 as "Unidentified airman" (in a Graves Concentration report form for 9 burials).  The form has various amendments in red ink dated 11/5/46 including his name and service number being added - so nearly 2 years after the crash, a year after the end of the war, and in nearby France, this is what was happening.  I can only assume he was badly burned and was identified by the registration of the Halifax and the remainder of the crew being accounted for.  All three who died are in the same cemetery but not together,

Unfortunately Old Maps became a subscription site due to mis-use by commercial interests.

Amongst the NLS town plans series there is no early plan for Merthyr Tydfil at 1:1056, c1850.  Those were only produced for larger places.  The only plan is 1:500, 1875, the same as the National Library of Wales.  It is a good plan but involves a lot of sheets, so tedious if you do not know approximately where to look.

Correction.  This is the georeferenced layer for that.
https://maps.nls.uk/geo/explore/#zoom=14.0&lat=51.74802&lon=-3.37527&layers=117746211&b=ESRIWorld&o=100

The NLS older street index is derived from the much smaller 6-inch scale, c1900, and I have found some streets are not named in that, in busy areas.

The Old Maps scans are those done by Landmark from the OS's own files, during the 1990s I think, and are not such good resolution as the NLS scans.
So it is swings and roundabouts!

Re my Reply #4  Irishman "laid in stable"

The head of the family in Howden was "Farmer of 13a of land", so not a large farm.  The household included his unmarried brother "farm labourer" and his stepson aged 16 "servant" which I take to be a farm servant, either of whom may have been working for other farms.  The Irishman has no relationship to the household entered on the form, just the word "about" written before his age, across the two columns for relationship and condition, and no occupation - only "laid in stable".

So I concluded he was not working for them, just passing through and was maybe added to the form after he had left, when the enumerator collected it.  I hope they had given him a meal.

In the 1851 census I found an Irishman spent the night "laid in stable" at a farm in Howden, Yorkshire, but not apparently part of the household.  Only a surname, Pushman, and uncertain age, "about 23".  I suspect he was in England because of the Irish famine.  I hope he succeeded in life.

As there is no OP to respond I am going to say thank you to AlanBoyd for another well researched piece of landscape, populated from accessible FH sources.

There are "allotments" over a large part of the map. The geometrical fields are those allotted by enclosure awards c1800 which brought former moorland commons into private ownership, probably with stone walling here.  There are also new straight roads, probably 60 feet wide between the walls, which contrast with older winding tracks, to give access to the allotments and to new farmsteads constructed at that time.

Allotment Head is an interesting shape.  It is a funnel, often found on the margins of commons as a place where animals are gradually brought into a confined space after being herded from open common.  It must have been part of the enclosure plan to leave a funnel open, leading down to a road. To the south, the name Intakehead is another enclosure word, land "taken in" from a common.  It appears to have two funnels and sheepfolds.

However large areas remained unenclosed.  The situation is explained beneath the words Allendale Common: 18,095 acres of Stinted Pasture, meaning each commoner owned a stint, an allocation of the number of sheep permitted to be grazed on the hills.