An excellent recreation, Paul! I've just taken a look at the August 1973 Railway Modeller to see your original inspiration - if you have an online subscription to Railway Modeller you get unlimited access to every back issue. Garden railways almost always feature in the August edition, but rarely LGB. The younger sibling, Continental Modeller, has shown a few.
Incidentally, I thought I would search the August '73 edition for LGB prices, but as far as I could see not a single advertiser was offering any such stock. Beatties of London definitely stocked LGB, as I worked a holiday job on the LGB counter at 112 High Holborn in 1970 - it took me 25 years to be able to justify (and afford!) my own garden railway.
Cheers
M