BBC have announced that the old MHEG BBC iPlayer support is ending in September 2016.

they list a number of TVs that this will affect and most are from Sony - broadly they are 2010 devices.

full list at http://iplayerhelp.external.bbc.co.uk/tv/v2_closure

edit: After posting I found an earlier thread on the same ... but that was from 2014 ... in which it said that the MHEG service was not closing ... time has moved on.

https://community.sony.co.uk/t5/televisions/bbc-iplayer/m-p/2151962#U2151962

the list from BBC includes:

Sony KDL-ssV5800* 2009
Sony KDL-ssW5810* 2009
Sony KDL-ssLX90x* 2010
Sony KDL-ssNX81x* 2010
Sony KDL-ssNX80x* 2010
Sony KDL-ssNX71x* 2010
Sony KDL-ssNX70x* 2010
Sony KDL-ssHX90x* 2010
Sony KDL-ssHX80x* 2010
Sony KDL-ssHX70x* 2010
Sony KDL-ssEX70x* 2010
Sony KDL-ssEX71x* 2010
Sony KDL-ssEX603* 2010
Sony KDL-ssEX605* 2010
Sony KDL-ssEX50x* 2010
Sony KDL-ssEX403* 2010
Sony KDL-ssNX503* 2010

Why we’re closing this version of iPlayer

We invest significant time and effort in maximising support for older TV devices and have successfully migrated many hundreds of different devices to the latest version of iPlayer for TVs.

However, unfortunately, it isn’t always possible to migrate older devices to a supportable version of iPlayer. It’s not cost efficient to maintain the implementation of delivering iPlayer to these devices, due to the backend systems and technologies (often 3rd party) on which they depend.