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Good advice. Cheers

Yes. The '1' is 'G' (obviously..?), the '4' is 'C', the '5' is 'D'. This same reasoning is used for all keys; simply counting up from the root note of the scale in question. It works for minor scales in the same way. Beware of the trap, using this simple system, when working out chords, as the '7' for a G7 chord is the 7, flattened (so 'F', and not 'F#'...). This is for convention reasons, rather than pure logic or maths; the G7 chord is not, strictly speaking, in the key of 'G', but is from the key of 'D', and is referred to as a Dominant 7th, leading the ear back to the key of 'G'. Just sayin'.