UC LHR - PVG

Hi Guys
First time posting and first time UC flyer. I was hoping you could answer a couple of pre flight Q's for me.
1. My flight is around 3pm - is there any restriction on how long before departure I can roll up and check in. I am going to be getting to LHR at around 9am so hoped I could go straight through to the clubhouse?
2. Seat selection - its an A340-600 I think, any particular seats to avoid or try and secure?
3. Any other advice on how to get the best out of flying UC as previous flights on club world have been a bit of a letdown!
Many thanks all!
First time posting and first time UC flyer. I was hoping you could answer a couple of pre flight Q's for me.
1. My flight is around 3pm - is there any restriction on how long before departure I can roll up and check in. I am going to be getting to LHR at around 9am so hoped I could go straight through to the clubhouse?
2. Seat selection - its an A340-600 I think, any particular seats to avoid or try and secure?
3. Any other advice on how to get the best out of flying UC as previous flights on club world have been a bit of a letdown!
Many thanks all!