Ok all you need to do once you have uploaded the above UK XML configuration is navigate to Physical Interfaces > PHONE Port and replace the OutboundCallRoute with:
{([1-9]x?*(Mpli)):pp},{(<#:>|999|112|101|111|116000|116111|116123|1471|1571|100|155|195|0[38]xxxxxxxxx):li},{**0:aa},{***:aa2},{(<**1:>(Msp1)):sp1},{(<**2:>(Msp2)):sp2},{(<**8:>(Mli)):li},{(<**9:>(Mpp)):pp},{(Mpli):pli}
Calls to 999,112,101,1471 etc all go out over the PSTN line.
Calls to numbers starting with 03 and 08 will also go out over the PSTN line. (e.g. 0300, 0330, 0333, 0345, 0370, 0800, 0808, 0844, 0845, 0870 etc.)