Looks like I'm unlikely to make this as Greater Anglia won't give me a bike reservation for the journey. Oddly they can't actually tell me why this is...depsite numerous visits by me and emails from their ticket office to the relevant person in charge etc, etc.
I've been told by the 2 regular travellers above that they've never needed a reservation on that service ( despite the website mentioning it ) so I've not bothered on this occasion ¯_(ツ)_/¯
Looks like I'm unlikely to make this as Greater Anglia won't give me a bike reservation for the journey. Oddly they can't actually tell me why this is...depsite numerous visits by me and emails from their ticket office to the relevant person in charge etc, etc.