Update: I followed up again via the Easyjet number 0330-5515-151 as the various e-routes and responses were not looking promising and hopelessly generic.
Datapoint - After a rather painful menu trail I got through to an agent and she was able to process my 'Travel Restriction Protection' claim for a refund against my EZY flight. It would seem she was able to tell at her end whether the booking qualified or not and then process the request and put it into a refund within 7-days queue. My flight UK to Germany qualified (as I was sure it would as I am not eligible to travel to Germany under their present restrictions). She said I'd likely receive the refund within 7 days. It turned out my return flight (separate booking) was eligible too.
All told around a 20 minute call and in my case worth the 0330- costs and slight difficulties hearing and communicating with the call centre.