I'm always amazed how much Heathrow has changed over the years since my first spotting visit in 1968, in those days it was always the Queen's building and I have a wide range of pics from there and I thought I would start off with a sequence going clockwise to show what the airport was like then - the south side was positively rural. I hope this will be interesting even if the image quality is disappointing.....
starting off from the high level balcony over the indoor lounge (where a lady used to announce each arriving aircraft from a list which frequently was out of order but in those days we didn't have FR24 and smartphones so anything was a bonus!) looking northeast-ish over to the north runway (I think):

and a bit further round to the 28R threshold

eastwards towards the BEA stands served by terminal 1


then the old British Eagle sheds, I can't remember who was using them by this time,

next we get to the (then) BEA maintenance area, the large Tristar hangar and then the original maintenance blocks and further round the 28L threshold, Myrtle Avenue is on the right side of this photo. This and the subsequent ones were taken from the high level viewing area towards the west end of the viewing terrace, it was always into sun which didnt help photography but at least the spotting views were reasonable

this is looking south across to the old Pan Am hangar which later disappeared under terminal 4, Cains Lane is just left of the hangar

continuing clockwise from the Pan Am hangar we see the Hunting hangar which was the main biz jet centre at the time (and a few biz props in those days) all that is now replaced by T4

the area between the Hunting hangar and the threshold of the old cross runway 05/23

a bit further round and in this pic you can just see the threshold of the old cross runway 05/23, the visible end being 05 which I don't ever remember seeing in use, there used to be fuel tanks on the airfield boundary and again (yes!) T4 brought about their demise!

this is as far round as I can find pics for, the VIP terminal is in the background and to the right but out of view is the cargo terminal which in those days was very small compared to what it has become. It's amazing how rural it was in those days!

hope they are interesting, I'll add some of my pics of the aircraft tomorrow if I can get away from decorating for a while!
comments welcome but I know they are a bit crap so criticism not really necessary unless you are expert on editing scanned slides which have turned rather blue!
Andy