Been looking at an old Wigan booklet I have, which lists local businesses and companies, and in it there are maps of the Wigan, Ashton, Golborne, Leigh and other surrounding areas. I can't tell what year this was from as the front cover is missing, but judging by the ad on the back cover of the Wigan Observer with the words "Read the Wigan Observer every Friday" and the cover illustration they used shows what could be 1974 date. Looking at the Ashton map around the Lowbank Rd, Skitters Wood, Old Rd and Woodedge area, it appears that the estate behind Pit Pony is shown with all the street names, as is the Woodedge estate with all the street names in place. However, on the 1974-1975 map I've viewed on the Old Maps website, the Woodedge estate isn't there. Those houses beside Skitters on Woodedge don't look like they're over 40s years to me, I would've thought early-mid 80s at the earliest. Unless the map was created well in advance of the when those houses where built?, but I can't imagine that.
Also, in the booklet I have (assuming it is from the mid 1970s), Haydock Park Station is labelled on the map, with "Race Days Only" underneath. According to the disused stations website, Haydock Park Station closed both to passengers and closed completely in 1963, so why it is still listed as a (presumably working) station on a 1970s map I don't know. I know they did run the occasional special rail tour well into the 70s.