the all—party home affairs committee says the transition period, which has recently been agreed, mayt to be compromised. they say it's down to the complexity of issues such as data sharing, the european arrest warrant and europol membership. mark easton reports. membership of the eu means the uk enjoys access to valuable police data bases, the european arrest warrant scheme and the services of europol. the government says it is optimistic about negotiating just as good a deal for when we leave, but after taking evidence from people from the national crime agency and other organisations which rely on eu security corporation, an all—party committee of mps says it does not share that optimism. we are worried that a security treaty will not be signed and implemented in time for when the transition period ends and that could leave us without proper extradition arrangements if people flee justice and flee from crimes, but also without access to criminal data that the police properly need. access to eu—wide data systems and the resources of europol depend on legal obligations underpinned by