Interviewing for a lecturer position in the UK
This is all pretty standard practise for UK  lectureships. They are basically testing your skills that will be required in the position. 

In the presentation they will want to see a demonstration  that you can communicate your own specialism to both an undergraduate audience (as in teaching class) and your research peers (like for a conference). They want to know that you understand how research  is done and where the money comes from (knowledge of funding sources), and some assurance that you demonstrate the basic skills to communicate and cooperate with others already in the department to achieve  that goal. They will also want some indication that you have done some background intelligence to discover their particular departmental specialisms and how your skills will fit in their niche. You should at least have read the pages on their web site!

The presentation is likely to be done in a "public" venue with most staff and PhD's invited, who will also ask you questions at the end, just as if it was a research  paper.

The  interview will be behind closed door with the panel, often with senior staff such as Deans and HR who will ask questions that verify things from your CV/Resume. They will find out about your past employment, measure your level of experience, salary expectation plans for career development and so on. They would want to know how long you planned to stay with them to know if their investment in you was returned. They would want to know that you were self assured and reliant and not dependant on your previous supervisors, but conversely not a loner who could not collaborate with the existing and future teams.