103639
At the show 's conception in 1984 , live action model animation would not deliver lip sync , but show co-creator Britt Allcroft and model director David Mitton did not see this as an inhibition .
 Britt Allcroft, David Mitton
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Britt Allcroft, David Mitton