On 29th January 2019, Peterborough MP Fiona Onasanya received a three month custodial sentence. During this period, while allowed out of prison under licence, her vote was decisive in requiring the Prime Minister to seek an extension to Article 50, rather than allow UK to exit the EU under UK law.
As a matter of principle, criminals should not be able to make new law whilst their custodial sentence remains unspent.