Paul Roberts made the mistake of decided to sell the name rights at a time in the past, which (I believe) Miller purchased and set up shop in Cali.

This "New Rigby" eventually went bankrupt in 2005 (link)

At some time in the middle of this, JR London re-opened, distancing itself in no uncertain terms from the Cali company (link)

there may or may not be a dozen lawsuits crammed in there somewhere, along with much hearsay, but suffice it to say the products offered by the two companies were really quite different in terms of quality.