Hi,correct the bird shown i have since checked on google and was 175 yards,i did take quiet a few shots that day and yes one was ver 400 but it was not the one shown,sorry about that never thought of using google till i saw it on here.
These are a few shots taken this morning.
I've found that the vast majority of birders' distance estimation is horrendous. My rule of thumb is to take half the distance that most people quote and that is generally closer to the truth :-O.
That first Red Grouse shot is fantastic by the way!