Sorry cant help with prices, but to give a guide for comparison purposes, here in spain a box of strips with 20 is 26 Euros!!!!!
ouch, how that compares with UK dont know, but everyone is spain pays for monitors, lancets and strips they are not provided free, unless ones diabetes is what they refer to TOP OF THE LADDER range, if your mid way or below, up to you to supply and pay for your testing facilities, having said that, the National Health service here in spain is amazing from care start during and end its impeccable regards backups and inhouse service in hospitals here in Mallorca is of highest excellence, unfortunately, cant say the regards their Diabetes system, that needs reviewed and updated without any doubt.
Hopefully UK has cheaper items than what diabetes are forced to pay here? Hope this assists in comparing.