I'm doing some G&S this weekend, but without the G.

[ImNotJohn] I wonder it's still called "orienteering" and hasn't made the jump to "orientationeering" in the twenty five years since I did any.
I miss the old OS maps. I stopped using them about the time they completed the old red-cover One Inch To One Mile series and began redoing the job in pink-cover 1:50 000 metric maps (talk about make-work in government!). They must have done all of the UK in metric by now I would think.
As a teen I salivated over the prospect of a complete collection of OS maps. I think I have six.
I've often wished for the same types of maps with the same degree of coverage in the places I've lived since leaving the UK, but other countries missed that particular boat and are unlikely to go that route now we have "better" GPS systems. It was one of the nastier shocks to find that other western countries didn't have super-accurate maps for the asking. I had to use boat charts and forestry "blueprint" jobs for the most part. Joni Mitchell had it right.

Incidentally, it took me about five attempts to type your screen name without automatically inserting spaces (I tried Im Not John, ImNot John, Im NotJohn, then did some of them again before I got my brain to do it right). I've never had that happen before. Did you design for that effect?

I'm doing the world premiere of "What happened here - a retelling of Lear" tonite, and the second and final-for-us-but-hopefully-not-for-the-author show tomorrow nite. Sunday is a rest day :oD First Sunday without either rehearsal or show since nehwwonktnodi...

[Sierra Mike] I answer to INJ mostly. In fact elsewhere I tend to be just NotJohn - Im not sure why I've got the 'Im' in the Morniverse.
I'm also a bit of a cartophile - I've got 2 shelves devoted to them at the moment. I have a version of the Stevierule^TM which goes 'No Map no Trip'.
OS maps now cover the whole of the UK at 1:25000 and are so much clearer than the 1:50000, which I use mostly for cycling. I still love the 1 inch tourist maps with the colouring & hachuring but you can't beat the large scale for navigating in mist/cloud. Also you get spoilt by the quality of orienteering maps 1:10000 or 1:15000 using specialised software, where you can navigate to the nearest 10 metres.

[S M & INJ] These come in an attractive orange cover, far nicer than the 1:50000s' lurid pink.

I have inherited dozens of OS maps from my cartophilic Dad, mostly 6th Edition but some older than that (pre-war). The expansion of some towns is phenomenal. Crawley, for example, was a compact place with a station and a high street but is now a vast, amorphous sprawl. The new 1:50,000 and 1:25,000 maps are more accurate and detailed than their older counterparts, particularly in regard of contours. There are sad (old meaning) bits such as "Course of old railway" and "Mines (disused)" (Yeah, so's mine). Even though the OS Grid has always been metric I'll never get used to heights in metres. My house is at 557 ft, not 169 metres, so I claim the title of Highest-living Morniverser.
[Non-mappies look away NOW] The OS Grid is a Transverse Mercator projection, prime meridian 2°W, based on a model of the Earth developed by Sir George Airy over 100 years ago. It's a tiny bit different from modern values both in size and degree of flattening. There is a scale reduction of 0.04%, presumably to allow for the expansion of the scale in the projection away from the prime meridian.