That's a pretty interesting deal for something that doesn't need to transmit a lot of data, but will need to do it long term. 100MB/month attached to a Pi that

That's a pretty interesting deal for something that doesn't need to transmit a lot of data, but will need to do it long term. 100MB/month attached to a Pi that has data for 5 years for only £16 looks to me like a great deal for an active monitoring site.