I've had a response from LG:
I have taken a look into this for you and as you have updated your TV and the issue still remains after an update, I would like to offer to raise a VOC (voice of customer) for you to highlight the problems you have been experiencing to LG Head Office so they can look into a further fix as soon as possible. We raise VOCs to inform the departments in LG that are non-customer facing of the difficulties and suggestions that our customers have. Please note, once this is raised you will not be formally notified of this, nor will you be updated on the progress of the VOC as it is an internal process. If you would like me to do this please could you provide the following information;
Date of purchase
Postcode
First line of the address
Contact number
Preferred Title (Mr/Ms/Mrs/Miss/Dr)
Serial number
If you would like me to raise this, please respond with the information requested above and let me know.
Please also confirm:
Are you happy for LG to contact you via email about our goods and services (including on product launches, special offers and future promotions) which we think may be of interest to you? You are able to opt-out at any time by contacting us directly.
Are you happy to receive satisfaction surveys regarding any of your repair experiences via Phone, Email and SMS?
You are able to opt-out at any time by contacting us directly.
If you have any further questions at any time, please do not hesitate to ask and we will make sure to help as best we can.
In the meantime, please also try a factory reset in settings > all settings > general > reset to initial settings > yes to see if this helps.
Thank you for your time and I hope you have a great day. I look forward to hearing back from you.
I've replied with the requested info so maybe they will look again at it ?
Thanks Rabbit. I got a response too from the iPlayer support team:
'Thanks for getting in touch with BBC iPlayer support.
We are aware of this issue that has been occurring for LG TV's when using BBC iPlayer.
Some people have reported blocky playback, interference, or flashing lines across the screen.
We've been investigating this with LG and they have recently released a software update: version 05.20.04. If you're experiencing these playback issues, we recommend updating your TV to this new software version.
To update your LG TV's software version, go to Settings > All Settings > General > About this TV > Check for update.
Also, can you let us know your iPlayer system information?
You can find out below:
Where can I find system information for my connected TV or games console? | iPlayer help
We appreciate your patience and thank you so much for your cooperation, it really is appreciated.
Kind regards,
*****
BBC iPlayer & BBC Sounds Support Team
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I have responded with requested iPlayer system information and noted as per original enquiry I have already installed 05.20.04 update.
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LG asking for speed test info, any issues with other apps, try reinstalling app, factory reset etc. Will respond.