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Just for people as uninformed as myself:

the UK will apply GDPR post Brexit http://www.blplaw.com/expert-legal-insights/articles/gdpr-an...

Consent isn't always required for lawful data collection within the GDPR. Article 6 of the GDPR shows other lawful bases for collection

https://ico.org.uk/for-organisations/data-protection-reform/...

Is the Underground a private institution? Is it government? Does GDPR provide exemptions for government institutions? Do the police assist the Underground in performing searches and data collection? Can the police assume "consent" when they collect your Wi-fi MAC or your Bluetooth ID or any other data your mobile device voluntarily broadcasts?

Yes, no, no, no, N/A as GDPR provides escape hatches for actions to do with 'public safety'.

LU is pseudo-private. It falls under TfL, which falls under the London Mayor.