I am a non EU National and currently residing in Ireland. I intend to travel to Northern Ireland (i.e. Belfast) by road and also possess a UK Standard Visitor Visa. Is there any Immigration Control where I have to stop and get my Passport Stamp if I travel by road?
If travelling by bus or train, at least on the main Dublin-Belfast route, the UK Border Force has "mobile" border control, which means they board some buses and trains either at or somewhere past the border to check passports/visas.
Technically, if you aren't checked when crossing the border, you need to go the immigration office in Belfast to have your passport stamped. In practice, it's OK. You can also send your passport to the Home Office to be stamped.