BT engineer visited to improve speed on line as BT sport changing from TV ariel to broadband. Since change have not been able to get sport, blank screen or no information or VMC999 sometimes comes up. I am able to get sport on my laptop.
Not sure what you mean by "not available on my TV". You need a Youview box to get the internet broadcast versions of the BT Sport channels.
I think the OP is referring to the BT Sport switch from OTA TV to Broadband through his Vision Box. In that case this may be useful: