Here are the official websites of the Bulgarian and British education policies as well as the website of the Stage Agency for Child Protection in Bulgaria. More useful links are soon to come...
http://www.education.gov.uk
http://www.mon.bg
http://sacp.government.bg
http://gov.uk/
Here are websites (in Bulgarian and English) containing e-textbooks and interactive lessons:
http://www.bbc.co.uk/schools/
http://primaryleap.co.uk/
http://www.tes.co.uk/
http://content.e-edu.bg/course/index.php
http://www.znam.bg/zmonres/edu/
http://www.lumosity.com
http://212.39.92.39/e/
http://www.english-online.org.uk/
http://www.obrazovanieto.com/
http://www.livemocha.com/
http://www.woodlands-junior.kent.sch.uk/
http://www.firstschoolyears.com/
http://www.year2maths.co.uk/
http://www.happychild.org.uk/freeway/bulgarian/index.htm
http://interactivesites.weebly.com/