Are NHS Engage devices usually locked?

I’ll be visiting the UK at some point and out of curiosity had a look at the Ebay UK site. There are a lot of Oticon Engage BTE aids available there, and I’m tempted to get myself a pair (assuming they are Oticon OPN 2, as reported on these pages).

However, I’ve also noticed quite a few posts here asking for the code to unlock these NHS Engage aids. Are Engages always locked, or just sometimes? If they’re locked, do we have the codes available (sometimes, never, always)?

I’m just trying to work out the chances of my buying a couple of Engages on Ebay UK and then finding out I can’t do anything with them …

Thanks in advance for replies.

PS suggestions welcome for sites other than Ebay where I can decent second hand aids in the UK

Dear Zebra,

I recently purchased OPN S1 BTE for UK Market Oticon Optim that were originally intended for the UK NHS Engage market. I am having trouble connecting/pairing them.

I have also seen several posts requesting the code to unlock these NHS Engage/Optim/Opn S1 aids for full programming or pairing capabilities, and you seem to have been able to provide assistance in the past.

Could you please send me the necessary code to unlock these hearing aids?

Thank you.