Pull the red bit off, get some penetrating oil onto the threads, then you can get a spanner on the rounded torx bit, I think it's an 8mm, clean up if it's worked, throw away if it hasn't.
Good shout. Will try taking the red bit off and getting a spanner in there.
That did the trick, thank you! Saved me a few quid there.
@snottyotter started
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Pull the red bit off, get some penetrating oil onto the threads, then you can get a spanner on the rounded torx bit, I think it's an 8mm, clean up if it's worked, throw away if it hasn't.