Trevi shower valve

[phoenix54]

Hiya- i have been given a Trevi mixer shower- problem is i cant work out if its a therm or a boost! How can i work this out please- tried looking at photos of the valve online but they both look the same!
I have a combi boiler you see so a boost would not be suitable! Hope someone knowledgeable can guide me please!!

 

[Charnwood]

Any help?

http://www.fastpart-spares.co.uk/downloads/trevit096therm.pdf

http://www.fastpart-spares.co.uk/downloads/Treviboost.pdf

The handles are different.
Boost:
http://www.selectbathrooms.com/zoom.asp?type=products&id=22420
Round handle with 4 scoops, one on each quadrant.

Therm:
http://www.selectbathrooms.com/zoom.asp?type=products&id=22409
Round handle with 2 scoops opposite each other.