A lot to say about this.

Firstly, while I loved seeing Anita again, this was not a natural addition to the plot. It worked in a thematic sense to tie together the endings of an era. But otherwise, this was ridiculously forced, unearned and actually, quite a pathetic way to solve the challenge posed. However, it did lead into the rebuilding of UNIT and the establishment of the correct universe and timeline, which was enjoyable.

Seeing UNIT in all its glory, did feel quite nice, and finally delivered on the scale that I was hoping to see from this rejuvenated UNIT - however, I think now its reached its climax, it might be time to retire this idea. A grittier, smaller and less polished UNIT will certainly be a welcome return. The darker side we began to see in Lucky Day, will be a good avenue to explore to see further here. Additionally, while UNIT was used well, none of its members particularly were, again it was a 'who can we see return to make fans happy' moment, which fell flat.

It was also frustrating to see the Rani and Omega underused straight away. I was worried Omega was going to be a big waste of potential, so I expected this throughout - but it still was not nice to see. The Rani, while superbly portrayed by both Archie Punjabi and Anita Dobson, was there for exposition, and under used in the story. A huge waste of potential of a well established, threatening and unnerving villain. And Omega, well - I liked the idea of him becoming what he wanted through this Underverse concept, and becoming a huge threatening beast, but what a waste of a villain who could be much better served in a full story, really delving into his God complex further. A saving grace was seeing Mrs Flood escape - a return will be welcome, in a smaller scale story which will really highlight the amoral scientist better.

The concept of Poppy as the wish, and the sentiment behind this really had heart, and was incredibly touching - it was nice to see how this was handled and flourished throughout as we developed this relationship and saw this grow.

If this has been the end of the story, it would have been a below average but redeemable final episode.

But the tacked on 20 minute ending, left a lot to be desired. Too many questions are left surrounding Poppy through this now. It attempted to wrap this up in this time, and establish Belinda as a mother wanting to get home all this time.

The return of the 13th Doctor to aide the regeneration was a nice little touch, and I do think that this was added to add some character beats that were otherwise missing - but I think this demonstrates that the 15th Doctor was under-served with time and the development to carry this emotional weight himself.

And then, it leads to the end of the story. The regeneration. Firstly, its undeniably clear, that this was a shoehorned addition with Ncuti Gatwa bowing out the role. I have loved his take on the Doctor, I truly have, and I wish we had more. More time to finish his storyline with Rogue - teased in Wish World, and now destined to go no further - and his storyline with Susan signposted since the start of season one. I am not sure what has led to this, but everything has pointed to this not being the expected ending for his Doctor, and this is disappointing as a fan of this era generally.

Additionally, the regeneration represents all the failings of the return of Davies. And, I do not want to deny, a lot of his return I have adored. But, there is a reliance on the past which is the most evident through this regeneration. Reliance on past actors, and return to his glory years, to try and rejuvenate the show, reeks of desperation, and a sign of this era failing to deliver on his expectations. Tennant was bad enough, but could be excused for an Anniversary, and to re-establish the show. But Piper, may be taking this too far. Please, do take this only as a criticism of Davies casting decision though. Billie Piper is a phenomenal actor, and I do think she is capable of great performances. But she should not be relied on to come back for Davies celebration of his own original era.

Certainly, a disappointing finale, for a season I have loved, and for an era and Doctor I have enjoyed.

I think, this indicates the need for something new, but Davies has unfortunately done the reverse, and pushed us backwards. I just hope to be proven wrong.