Well:
No-one was intimidated out of, or into, voting
No ballot boxes were stuffed
No ballot boxes "went missing"
Counts were held in the open and under constant scrutiny
The electoral roll didn't contain fictitious names
No-one was murdered for voting
Voting was secret
And, if anything on that list did occur, there would be a serious investigation under British law.
Apart from that, probably not very fair at all.
I haven't read any of your posts on this thread (I genuinely haven't read this thread for reasons I've made abundantly clear) but can I assume that your question is based upon a "fair" election being one that results in the government you would have preferred?
Vin