[ESS] Syntax highlighting with R

[Graham Smith]

I suspect this is much an emacs question as an ESS question, but could
someone help me with what I need to do to get syntax highlighting in
ESS/R

At the moment I have this in my .emacs file

(global-font-lock-mode 1)                    ; for all buffers
'(inferior-ess-R-font-lock-keywords)
'(ess-R-mode-font-lock-keywords)
'(show-paren-mode t)

But it seems to make no change to the syntax highlighting in ESS, so I
assume I am doing something wrong and this is related to my lack of
expertise with Emacs, but would appreciate some help.

Many thanks,

Graham