what would you recommend the next move should be on this?
There is only one action open to you procedurally and this is for the recipient to complete and submit the WS in time!
So firstly, are you the addressee(AKA recipient)?
If so, then you complete the WS by ticking only one box, dating, signing and sending to TEC using one the methods offered and within time.
Without going back over the thread, which grounds apply to you? To keep this short the whys don't arise, only the whats. So which grounds? Is it:
a)that P did not receive the enforcement notice;
Noting that the following applies:
“enforcement notice”, other than in regulation 35, means—
(a)a regulation 10 penalty charge notice, or
(b)a notice to owner;
(a) doesn't apply here, so it's (b), yes?
Pl don't get distracted by anything else e.g. the format of the OfR, it's irrelevant at this stage.