The moral? Don't forget you can say no to ATC! Don't do something just because they asked for it and you think they are in charge - I realise now that I attempted to position for a runway I couldn't see because I had mentally handed command to ATC.
Wise words, Tim!
From an ATCO's point of view, it can be enormously frustrating when a pilot accepts an instruction they are unable to accept. At best, there will be a bit of mild swearing (off RT, I hasten to add!) when we're forced to hurriedly come up with Plan B. At worst, it can compromise safety - not only of the a/c concerned, but for other a/c too.
Don't be afraid to say you are unable to accept an instruction - we are here to help you!
Foxy