I have a requirement for 3G/GPRS roaming across Western (mainland)
Europe. I don't particularly need 3G/GRPS connectivity within the UK.

If I use a UK provider such as Vodafone, it works out at around £7/MB.
Are there any better deals available (including options such as non-UK
contracts)?

FWIW, typical usage varies tremendously but should be no more than
1GB/month, but hopefully closer to 100MB or so. Typical countries
include France (Toulouse, Paris), Belgium, Spain (Madrid), Germany,
Italy, and Portugal.

Thanks,
Chris