I asked myself how I2a-din ended up in Britain. And now I found the answer!
Marcus Aurelius send 5500 Sarmatians to Britain!
"Archaeological evidence of Sarmatians has been found also at Chesters ..."
And not the Germanic tribes but Iranic tribes were the real power around the Black Sea and North of the Balkans!
Incredible, didn't know that Emperor Galerius (293-311) even had a Sarmatian bodyguard!
I took this from page 50-51 from this book:
more about this subject: 'From Scythia to Camelot', by C. Scott Littleton and Linda A. Malcor