break down of all RoR drops by substring match:
5 letters:
4442 londo
3927 north
3781 chris
3761 green
3561 south
3328 inter
3024 david
2731 black
2313 littl
2304 first
2254 smart
2171 simpl
2091 cheap
2080 elect
2076 peter
2061 steve
2047 james
2037 busin
1971 white
1934 creat
1922 desig
1901 motor
1900 onlin
1864 digit
1794 world
1786 scott
1786 mobil
1780 trave
1737 andre
1709 sport
1688 clean
1671 premi
1663 weddi
1658 kings
1640 richa
1630 healt
1628 globa
1596 super
1591 briti
1585 trans
1577 prope
1564 compa
1560 holid
1541 natio
1483 disco
1464 class
1463 secur
1453 photo
1419 brigh
...
6 letters:
4436 london
2311 little
2031 busine
2005 electr
1939 christ
1913 design
1898 online
1737 travel
1737 digita
1662 weddin
1625 health
1623 global
1610 richar
1576 britis
1553 mobile
1552 holida
1533 nation
1516 creati
1505 proper
1488 andrew
1451 simply
1386 intern
1383 bright
1371 direct
1333 privat
1319 premie
1307 michae
1285 garden
1227 kitche
1218 robert
1199 classi
1158 silver
1135 martin
1085 scotti
1084 person
1067 capita
1047 oxford
1017 northe
1013 custom
1004 carpet
997 natura
984 cambri
980 comput
953 willia
945 castle
941 bristo
937 sports
934 market
931 family
912 office
...
If anyone wants other variations just run something like this from your Mac/linux command line:
cat ?-?.csv | sed 's/co.uk,.*/uk/' | sed -E 's/^(......).*$/\1/' | sort | uniq -c | sort -n -r | head -n 25