The ICO have created some helpful videos about Freedom of Information Act (FOIA) and Environmental Information Regulations (EIR).
Module 1
Part 1: Overview of FOIA and EIR
Part 2: Requests under FOIA and EIR
Part 3: Responsibilities of the ICO under FOIA and EIR
Module 2
Part 1: Appropriate cost limit
Part 2: Vexatious, repeated and manifestly unreasonable requests
Module 3
FOIA exemptions and the public interest test
Module 4
EIR exceptions and the public interest test
Module 5
Part 1: S40 and r13: the personal data provisions