Cambridge Rollerbillies have continued to be upwardly mobile in the Women’s Flat Track Derby Association European rankings. Rollerbillies sat 92nd in the standings just a few weeks ago, but following recent back-to-back victories over London Roller Derby and Essex Roller Derby, they have shot up to 66th place. Saturday’s 180-70 win at the expense of Essex, which was played in London, has left Rollerbillies second in the WFTDA-side Tier 3 East table, three points adrift of league-leading Kent Roller Derby. And having picked up the silver medal for a second year running, Cambridge have secured t…