First of all, if you want legal advice, then you should consult a professional - not seek advice from random people in an Ebay forum.

If you take out weekends and Easter holidays, it is only 7 complete days since the money to verify was paid into your bank account.

I think you just need to be patient.  You are an infrequent seller who has sold a high value item so you may have to wait 14 days or more for the funds to be released.

Details about payment holds are in the user agreement.