There is simply no evidence that the final 4 episodes were 'specials'. TVDB had an issue where compilation DVDs were added as a 'season 2', and I believe that this is what has happened with the final 4 episodes, only that they were added as season 0 'specials':

https://forums.thetvdb.com/viewtopic.php?f=18&t=16739&p=61637&hilit=maisy#p61637

IMDB is a mess, in that it is organised as per the US broadcast in 4 episode blocks, but it is divided into the 'seasons' that the DVD release used: http://www.imdb.com/title/tt1176301/episodes?season=1&ref_=tt_eps_sn_1

The Wikipedia episode list appears to be the most complete, with additional descriptions that are longer than in the IMDB listings. I believe that this was lifted from the CITV or Nick Jr site at some stage, but this is no longer online, or in the wayback machine: https://en.wikipedia.org/wiki/List_of_Maisy_episodes

Lastly, each episode of the series is distinct, with titles and end credits. Although there is no authoritative source, there is enough circumstantial evidence to show that the series should be listed as individual episodes.

It would be great somebody could respond to this. It has been 4 days. I was only trying to fill holes in your content, and all I got was a snarky reply then silence.

The Wikipedia episode list appears to be the most complete, with additional descriptions that are longer than in the IMDB listings. I believe that this was lifted from the CITV or Nick Jr site at some stage, but this is no longer online, or in the wayback machine: https://en.wikipedia.org/wiki/List_of_Maisy_episodes

If the dates are correct, there's a one year hiatus between the last episode and the last four episodes. That's a bit suspicious to me. Also, I'm wondering if the DVD cover mean they were released directly on video.