Any liquid glue at your LHS will do. So would and tube glue.. I use Testors brand and they work just as well. As far as paintbrush goes. I have a variety. Red Sable are good as well and comes in a wide range of brush sizes. It's never too late to start modelling. I just returned to this hobby after 20 plus years away. I'm finding out I haven't lost much touch but have learned new techniques along the way. One of them is using an airbrush for the first time. I had a Paasche single action airbrush brand new still in box when my grandmother got one for me I never got the chance to use. This is going back to the early 80s. All I needed to do was buy an air compressor. LOL!
Sprue cutters are a must have and a nice Xacto knife set is a godsend as well. You never know what size blade you find works best for what situation.
I have a wide variety of paint brands (both enamels and acrylics) in my stash but have worked with acrylics and finding them easy to use. I use mostly Testors Model Master (enamels & acrylics), Tamiya, and a couple of other brands like Valejo, Humbrol, and Floquil.
Micro Sol and Micro Set are good for decal setting and a nice to have. There are similar products as well but not sure what you get in the UK.
BTW - welcome to the hobby. :)