SkyEcho2 with the UAT element switched to FLARM is probably the best option available.
UAT uses an ICAO approved protected aeronautical frequency and is the system of choice at lower levels in the USandA. The UK hasn't invested in either the Recognised Air Picture or ground infrastructure to support it yet, unfortunately.
France is quite keen on UAT, but it'll be a long time before Europe has the same FIS-B and TIS-B availability as the US.