Preparation of contact list of UK based Journalists in Technology, Finance and Travel

I need to put together a list of Journalist in UK who work in - Finance, Technology and Travel sector.

The journalist would be working for UK based newspapers , online technology portals/websites etc.

I need their name, email address, name of the media company.

I am sharing few examples of three well known newspapers:

Telegraph- http://www.telegraph.co.uk/journalists/
London Evening Standard - http://www.standard.co.uk/news/contact-evening-standard-7185764.html
The Guardian - http://www.theguardian.com/technology/2014/dec/15/guardian-technology-staff

I would need a list of about 100 journalist EACH in Finance, Technology and Travel sector.

This work would require search on GOOGLE.CO.UK a lot and looking into various websites.
Usually the email address is firstname.lastname@company name

What you need to do is look for journalist through various search mechanism espeicially looking into TECHNOLOGY, FINANCE and TRAVEL SECTION of these newspaper website, looking into articles, who wrote them and then adding their name to the excel list along with email address.