It's not here, but you could park your car nearby.
Walk round Spitfire Road Castle Donington - less than half a mile from the marker. Identify 3 of the pairs of houses where the numbers, on the odd side, are the wrong way round, e.g. 3,5,7,11,9,13 would give you 9 and 11.
Add each pair of numbers together and divide by 2. Write the resulting numbers down in ascending order to give an 8 digit number. As a check the 8 digits should add up to 35.
Then the final location is N52 50.ABC, W001 21.DEF. Where A=digit 8, B= digit 2, C=digit 5, D=digits 3 and 4 added, E=digit 6 and F= digit 2-digit 5.
Turn right twice if you enter the estate by car. All are visible from the pathway. They are between 71 and 165. But not 131 and 133.