I was looking for old charts for Shannon and happened to come across the Aladdin's cave of old charts and documents for several UK (as well as Irish and many other) airports. It's well worth a look. Konbriefing seems to specialise in military fields - and there's also a link to a FB page, but here's a link to the old Heathrow charts, which date right back to the 1950s, when Heathrow had its "Star of David" layout.
There's literally hours of reading - and reminiscing - from all of the links there. Enjoy!
https://konbriefing.com/mad/approach...w-airport.html