Can I Buy a Re-Entry Permit During My 90-Day Report?

Hi gang,

I recieved my 1 yr extension based on marriage this morning.

Without your advice I couldnt have done this.

A big thank you from my Mrs and i.

Many many thanks.

Ps I forgot to buy a re entry pass , I've no plan on returning to UK but I'd like one in case of emergency.

Would it be possible to buy one when I do my 90 day report you think ?

Or is it relatively hassle free doing it at airport if needed ?

Preferably I'd like to have it as piece of mind, but not essential .

Massive thanks once again, your priceless.