Roaming charges whilst using a third party eSIM abroad

[Speeding01]

I am planning to buy a third party eSIM for data roaming whilst in Greece ( Saily  probably). 

My sky fair use limit of 25gb was completely used up by my Son who is on the same plan as me so I now need to use the eSIM to avoid penalty charges from sky. 

Question.   Will sky recognise that the data I am using in Greece is not via the Sky sim but via Saily instead.  

My objective : to avoid paying for a third party Sim but still get penalty fees from Sky. 

[PandJ2020]

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@Speeding01 wrote:

My sky fair use limit of 25gb was completely used up by my Son who is on the same plan as me so I now need to use the eSIM to avoid penalty charges from sky. 

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The 25GB limit is per dataplan.

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Question.   Will sky recognise that the data I am using in Greece is not via the Sky sim but via Saily instead.  

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Not if you ensure the 3rd party SIM is connecting to the cellular rather than the Sky SIM.