"What was the point of it?": Collateral viewers were seriously confused by the final episode
The BBC2 drama audience saw fault in the lack of "deep" storylines and Carey Mulligan pole vaulting

From the tale of two murders to a troubled shadow transport secretary and, of course, Billie Piper launching a pizza on the floor, Collateral had plenty of plots thrown into its story. But did the final episode weave them all into a satisfying conclusion?
Not exactly. Although we saw Karen (Piper) get her money by stealing from her au pair, Kip (Carey Mulligan) uncover a people smuggling operation, and Peter Westbourne (Richard McCabe) revealed as the villain behind the whole thing, viewers were left confused. In particular, many couldn't see the point of several characters.
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https://twitter.com/andyturner123/status/970844987700203520
https://twitter.com/synthesisdream/status/970781496347906049
https://twitter.com/jid1993/status/970787824936026114
Some simply thought the plot was spread too thinly across the show's many faces...
https://twitter.com/mokofil/status/970922915444219904
https://twitter.com/AyyHsaid/status/970829062821306374
https://twitter.com/uisgebeatha/status/970780347817431040
And viewers were left disappointed that the references to Kip’s pole vaulting career never had a payoff...
https://twitter.com/sbl1976/status/970918062714183681
https://twitter.com/JoStannard/status/970804421025255429
https://twitter.com/timbisset/status/970788170869673985
https://twitter.com/FerrousFred/status/970766968562339845
https://twitter.com/paulwtrueman/status/970779252588269568
But although there were those who were satisfied with the "intelligent" ending...
https://twitter.com/KingOfHits/status/970781437338308610
https://twitter.com/miguelhunter/status/970782387889197056
https://twitter.com/dlhmarketing/status/970781363061383173
...others were left asking what the point of the drama was.
https://twitter.com/JamesFromLeeds/status/970825697655775232
https://twitter.com/Dalto65Sarah/status/970782346952749056