Somewhere to the north-west of Heathrow? Garston (GAR) is shown on a 1968 plate as using 112.3 as a frequency, that is pretty close to your 112.25 VOR. There is more about this beacon on this page:
https://www.pprune.org/archive/index.php/t-490432.html. If this is a US built contraption, it is more likely to be a setting somewhere on that continent of course. It may well be a fictional combination that was cooked up to suit most training scenarios of course.
That's a nice DAF you've got there by the way!