If there's a radar controller on (which there usually isn't) you can get vectors to the ILS, otherwise you'll have to fly the whole procedure including the NDB outbound bit[#], in which case you'll have a Procedural Service.
Radio is (
AFAIK! - almost all my approaches have been in class G) the same as for controlled airspace.
If ATC happen to notice them they might tell you about a gaggle of microlights flying across your path at 20 knots, but if you'r visual it's
your job to see and avoid.
[#] Actually there are three ways of avoiding the NDB outbound bit in addition to vectors:
(1) Direct join as shown on the plates, I've not tried this myself, DME arc.
(2) Cambridge does have a GPS approach. But I found it so easy that it seemed like a waste of expensive instrument time!
(3) Tell ATC you're self-positioning for the ILS in VMC ... intercept it somewhere above Lakenheath, using a method of your choice (eg GPS, or even by looking out of the window if it's
actually VMC).