StarBlazer:LivingSkinny: Don't forget to top the SIM up in the normal way to ensure the Combo renews!
If the combo expires are you able to purchase a data only combo again when required or would I have to buy a new SIM. There are no links on the account or combo pages for buying a data only combo (or are we just a little ahead?).
When you register an account for a data only SIM you would just see the Combos applicable for that SIM. The data only Combos are not available to customers with standard SIMS (and vice versa). So yes with a data only SIM you can buy any of the three available data only Combos.