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The answer is 'yes' or, more confusingly, 1830mm.
Don't do the posts first, just the one at your starting point, then fix your first panel to it. That will show you exactly where the next post will go and so on. Dig holes 2' or the metric equivalent of your choice deep, using 8' 4"×4" posts for 6' high panels (you can get get away with 3"x3" for a lower fence). Dig the holes 8" wide, allowing for 2" of dry mixed concrete (1 shovel cement: 4 shovels ballast) all round the post, whack the concrete solid all around the post with the end of a broomstick or similar. Job done!
A post level from Screwfix for about £4 is helpful in this process.
Here endeth the sermon, Amen.
A 4x4 post installed by this method would be more than adequate for @aggi. Final note: don't be tempted to use Postcrete, it's shite. About half an hour per post from start to finish is about right.
ColinTheBald-
That's what I thought, but then I started seeing diagrams like this that made me think otherwise.
I'm actually fitting it on top of a rubble wall via some chunky galvanized brackets I have. Post level is a good shout though, there should be the possibility of a bit of shimming to the bracket to get things plumb.
Polygon
I need to put in my fence soon, are fence panels 6ft or 1800mm? I can see both online so I assume the answer is: it depends.
Issue is I haven't chosen mine yet, was going to fit the posts first.