Firstly, this website is 90% there. My 10-odd year experience says you can tweak a bit more conversion but it's going to be minimal and I would spend time on distribution & marketing. Otherwise from my look-over;

First thing I noticed is no Google Analytics. Are you running some web analytics? If not this should be your first (and easy) update so you can monitor what is happening on-site.

Second I'd look to simplifying messaging. For example - you say 'Cosy bedding packs for students'. Why have 'for students'? There are lots of copy points like this that can be stripped and focused. Have a read through and see what you can remove.

Store/FAQ/Contact US - you can probably get rid of the headers saying what the page is. It just pushes content down with little benefit.

I tried the order process (York St John University) and it got stuck at 'order with paypal'. Should this be working? I tested from Australia so that may have an effect.

And take anything I said here with a grain of salt. A/B test changes. Opinion is never fact.