Sharing special category data
For most of the conditions for processing special category data, you must be able to demonstrate that the processing is ‘necessary’ for a specific purpose. ‘Necessary’ does not mean that the processing has to be absolutely essential, but it must be more than just useful or habitual or standard practice. It must be a targeted and proportionate way of achieving the purpose described in the condition.
The condition does not apply if you can reasonably achieve the same purpose by some other less intrusive means – and in particular if you can do so by using non-special category data.
You have also indicated that you are relying on:
You must record your reasons and (where applicable) the justifications for making this decision and this should include recording the specific legal obligation or right as explained above.