Website Developer to help make our website mobile friendly

General information for the website: Website already up and running, need its performance improving.
Kind of development: Customization of existing website
Description of every page/module: Hi,

Our website is www.imperialclaimsconsultants.co.uk

Just used a Google provided 'how friendly is your website' tool and for the mobile we got 44/100 and for the PC we got 51/100. Obviously want this dramatically improving. Website tool at:

http://developers.google.com/speed/pagespeed/insights/

It gave us comments such as:

Should Fix:
Enable compression
Show how to fix
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Show how to fix
Leverage browser caching
Show how to fix
Optimize images
Show how to fix
Consider Fixing:
Minify CSS
Show how to fix
Minify JavaScript
Show how to fix
Minify HTML
Show how to fix
Description of requirements/features: Need to improve:

Should Fix:
Enable compression
Show how to fix
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Show how to fix
Leverage browser caching
Show how to fix
Optimize images
Show how to fix
Consider Fixing:
Minify CSS
Show how to fix
Minify JavaScript
Show how to fix
Minify HTML
Show how to fix
Extra notes: