Virgin don't have to notify you about it, they don't promise you the same IP address. The IP address probably changed when you connected directly then back again when you connected the router.
What has happened is you just moved to a different bit of equipment in Virgin Media, probably the new equipment the 50Mbit service goes on, I can assure you that viruses and trojans can't change your IP address for you or change where the IP address is located according to geolocation.
The geolocation is just pulling records from
http://www.ripe.net to guess where you are - these records are cryptographically protected from being changed by anyone bar the proper administrators.
Borrowing the details from a modem in the IP range my modem lives in note the bolded bit, even though I'm in West London it says Bradford which is where the IP addresses are administered from... which is where a site like your one will guess the location from.
http://www.db.ripe.net/whois?form_ty...&submit=Search
inetnum: 82.43.120.0 - 82.43.127.255
netname: BROADBANDAUDIT
descr: BROADBAND CROY UBR02MORT
country: GB
admin-c: TWIP1-RIPE
tech-c: TWIP3-RIPE
status: ASSIGNED PA
mnt-by: AS5462-MNT
source: RIPE # Filtered
role: Telewest Broadband IP Network Services
address: Genesis Business Park
address: Albert Drive
address: Woking
address: Surrey UK
address: GU21 5RW
e-mail:
ripe@telewest.net
remarks: To report abuse:
remarks: file an online case @
http://netreport.virginmedia.com/netreport/
admin-c: JH15424-RIPE
tech-c: SA3620-RIPE
tech-c: SB5110-RIPE
tech-c: JH15424-RIPE
nic-hdl: TWIP1-RIPE
mnt-by: AS5462-MNT
source: RIPE # Filtered
role: Telewest Broadband NCMC
address: Communications House
address: Mayfair Business Park
address: Broad Lane
address: Bradford
address: BD4 8PW
e-mail:
capacity@telewest.co.uk
admin-c: DL2891-RIPE
admin-c: SR10413-RIPE
tech-c: JH15424-RIPE
nic-hdl: TWIP3-RIPE
mnt-by: as5462-mnt
source: RIPE # Filtered