HI the site looks good and really clean.
What you have to do next is figure out your keyword phrase. The first thing you have to consider is you have no casinos that all US players – so you don’t want to target them so maybe something like “The Best Casino Reviews for UK” (just an example)
This goes for your title tag as well – no one is going to type in allthecasinos com so figure out the KWP and put as your title tag as well plus more character to add you to about 60 eg The Best Casino Reviews for UK Online Casinos and Sports Betting
HOME is not a good word to link to your home page – use a short version of you KWP eg Best Casino Reviews
I also see you are linking to your home page (from the boottom of you home page) with allthecasinos change that to your KWP
When I click on the william hill page the type is a little washed out – bold it or use a different colour – same goes with you ‘drop down” words of you main header
I aslo see you are using alt=”allthecasinos” change it to eg. alt=”your key word phrase” or alt=”uk casino review williamhill”