I rang CAA to check how the counter service works I am now told that although my FRTOL expires 2016, I need to have a test and fill in SRG1199 to verify that as a born and bred Englishman of 55 years that I can speak English properly!
It seems absurd that having just had a telephone conversation with someone (I assume to be) a native speaker, any further test is required, and indeed I have heard of pilots claiming to have been certified by precisely this means.