following on from early thread posts...

Now you see, this is how i pronounce fleet numbers:
4 digits (example: 8243) - eighty two forty three
3 digits (example: 524) - five two four
5 digits (example: 27051) two seven oh five one

same applies with service numbers:
2 digits (example: 43) - forty three
3 digits variation 1 (example: 130) - one thirty
3 digits variation 2 (example: 131) - one three one
3 digits variation 3 (example: 100) - one hundred

for express services or services with a prefix or suffix, take the 2 digit rule and add the letter sound in front or at the end