Oil tank testing- can you help me?

Reading through the many sites I have come across from using this site I noticed you do something beyond what we do here for oil tanks and testing them.
I'm rather interested in the means to do this here in the UK. As far as I know no one does it (domestically that is) can anyone that uses the equipment PM me with costs and information on the systems (ultra sonic I understand) out there ie pros and cons, time taken to test, costs of the equipment ?

TankSure® this seems to be the popular method.

Many thanks.