But the bad news is that the schemes require a 10-year commitment.

"Obviously such a scheme would require protection and life support," Haber said.

These schemes also require clever programming to keep the critical sections very brief.

However most schemes of this nature require governors of some sort or another.

And still simpler schemes require no special software at all - or even the need to send anything.

The scheme requires an assessment of £150 or more to determine what if any work can be done.

The scheme required significant infrastructure in power generation to support the pumping stations.

This scheme required another parking disc that would allow for 24 hours to be shown.

But the scheme obviously required the sales of hard liquor.

One successful scheme requires access to the mailbox of a person listed in the local phone book.