Many thanks for all the useful input everyone, it's much appreciated.
What I have read is definitely reassuring. I did indeed land at the intended aerodrome, just with a modified route. With regards to use of the term 'divert', isn't this context how the term is used on the PPL syllabus? I seem to recall the exercise involving putting the aircraft into an orbit and plotting a new route in the air always being referred to as a diversion?
I guess my bigger concern is the VFR/IFR issue. Can you really navigate by tracking a VOR and still call it VFR flying, as long as it's in VMC?