Filming in Cardiff July 29 and 30

In the last week of finale filming:

Sunday, July 29:

There was some Doctor Who filming outside Cathays Llywodraeth Cymru offices in Cardiff. The sign outside was covered with one that said, "MDZ Research".

#dwsr pic.twitter.com/qGHJHr3Cnv

— Morgan Bailey (@BailsBach10) July 29, 2018

It involved an unknown actor filmed inside of a car.

#dwsr side character... MDZ research... Is doctor who confirmed, 'doctor who' director clip board pic.twitter.com/vMGyrdwx5c

— Morgan Bailey (@BailsBach10) July 29, 2018

#dwsr pic.twitter.com/JQChz2kTRZ

— Morgan Bailey (@BailsBach10) July 29, 2018

#dwsr pic.twitter.com/Km9oX3RKTO

— Morgan Bailey (@BailsBach10) July 29, 2018

Monday, July 30: 

This time there was filming at the smart bridge opposite the Atrium building at Cardiff University. 

How rare, finally caught some Doctor Who filming in Cardiff! #DWSR pic.twitter.com/NUbZ01oVwP

— Craig Fraggle (@craigfraggle) July 30, 2018

It involved the TARDIS, Mandip Gill and a least two actors, one with bright red hair.

KIN + ILK CQ is staring in Dr Who today! pic.twitter.com/cwlcelA0Kf

— KIN+ILK Cap Quarter (@KINANDILK) July 30, 2018

#DrWho #filming this morning. #cardiff pic.twitter.com/vFRKwRfH95

— Jeremey Barrett (@jeremey) July 30, 2018

#drwho filming today... pic.twitter.com/ainLfPRCgm

— Mark Barry (@swalesmetroprof) July 30, 2018 

Doctor Who filming right now, in Cardiff, over the smart bridge opposite the Atrium building. #dwsr pic.twitter.com/eICjxKyvdb

— The Silver Cloak (@TheSilverCloak) July 30, 2018

You can't park that there! #DrWho #Tardis #Filming pic.twitter.com/PkfyOKLr80

— Adam Wright (@officialwrighty) July 30, 2018