Thank you for the advice, I have managed to pick up a £12 travel lodge room in Holyhead 1 mile from station - quick taxi required!
Good price. I have stayed there a few times, it's OK. Most importantly it seems to be pretty quiet, no pubs, clubs or takeaways within earshot.
No taxi necessary unless you have heavy bags. It is a 5 minute walk at good pace, nowhere near 1 mile as long as you go the right way.
To walk there;
Leave through the railway (platform 2), not the ferry treminal entrance or footbridge.
At the far end of platform 2 exit to the station approach road. At the top of the approach road turn right, you will see the travelodge now in front of you to the left but there is no pedestrian access in that direction.
Turn right again at the traffic lights. Cross over this road at the pedestrian lights and walk back towards the travelodge on the adjacent lower road.