This is interesting. Time Team S13 E12 on You Tube excavated a Roman Mansio and Tax Collection point on Steyne Street, Alfoldean, Sussex. Relevant part starts at 40.0 out of 47.53 minutes.

https://www.youtube.com/watch?v=rZiOqr1-CK4&t=1310s.

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Iron, The Romans and Dean. RogerrGriffiths 2018-10-01, 10:41 AM
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Iron, The Romans and Dean. (General)