You have a choice of two transmitters, both of which carry all of Freeview.
http://www.wolfbane.com/cgi-bin/tvd.exe?DX=L&HT=10&OS=le2+8hx
However, the results would indicate that, either way, you are in a marginal reception area. Based on those results, you
WILL need a proper aerial installation, which may also require a masthead amplifier. The right aerial installation will have a far, far bigger impact on your experience than choosing the "right" box, but, if one is necessary, will cost more than £30.
Of course, as with all things RF, you may just be lucky. It does no harm to try a box on your existing aerial. But I think you should expect patchy results.