First night out... - Where to park? Tipping at Magor

So, tomorrow (Friday) I have my first night out. Start at 0630, take empty trailer from Diss to Felixstowe, load and off down to Magor to tip for 1600. Can anyone recommend where to park in that neck of the woods? I’m assuming I’ll be on my way back to Diss when I’ll need to park, so will be empty.

Probably already aware, but this site can be quite useful.

hgvparking.com/