Header does not behave for smartphones/tablets

Hi

My child theme http://www.greenlabpestcontrol.co.uk does not display correctly when I test it on smartphone etc. (http://www.mobilephoneemulator.com/)

Especially,the telephone numbers which are part of the header image and placed immediately below the tag line, these numbers are all over the place, also the graphics on the right hand side disappear on a smartphone.

I have tried most of the relevant suggestions on the forum but nothing seems to help.

Can any one assist me please.

BTW…how do I efficiently do a “search” on the forum.