It would be interesting to see the age profile of people getting 10. For someone of my generation, they weren't particularly difficult, but when I was at school it was important to spell properly (or you lost marks).
Spelling's not such a high priority now so these wouldn't so easy for a younger generation.
I was surprised that they didn't have 'lose/loose' and 'there/their/they're' there.
10/10 naturally. Anybody who gets less than 6 is seriously dense.
Just editing to answer Gwylans question. I'm 47. Mind you I went to a Comprehensive and I was about 13 when I found out English had verbs - it wasn't just French!