The contribution from Britain to plastic waste in the oceans is practically zero.

Ninety per cent of waste in the sea comes from just ten rivers. Eight of them are in Asia and two are in Africa.

https://www.ufz.de/index.php?en=36336&webc_pm=34/2017
The increased use of paper bags and thicker bags uses more material and increases carbon emissions.

Thick plastic ags must be used 37 times, paper bags 34 times, and cotton bags 7,100 times, to have a lesser impact on the environment.

https://www2.mst.dk/Udgiv/publications/2018/02/978-87-93614-73-4.pdf
There's also potential impacts on human health because of a greater risk of harmful bacteria.

After San Francisco's plastic bag ban, there was an 50% spike in bacteria-related ER and deaths.

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2196481
So single-use plastic bag bans are actually awful for the environment, harmful to businesses, inconvenient for consumers, and even hurts our health.
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