Refusals here are rarely about the paperwork
Visitor applications are refused on two things far more often than any other: whether the caseworker believes you intend to leave, and whether your finances support the trip you have described. Both are judgements about credibility, which is why a technically complete application can still fail.
What actually gets checked
Whose money is in the account, and how long it has been there. Whether your stated purpose is permitted on a visit — business visitors may attend meetings and negotiate, but may not work or be paid by a UK source, and the line between those is where most business travellers slip. What ties you to home: employment, property, dependants, study. And any previous refusal, anywhere, which will be on file and will be read again.
Marriage Visitor
A separate route, for marrying or forming a civil partnership in the UK and then leaving. It is not a route to staying — if you intend to remain with your partner afterwards, that is a different application, and applying as a visitor first can make the later one harder.
What we do
We confirm the right visitor route for what you actually plan to do, build the financial and tie evidence properly, and write the cover letter that sets out your itinerary and intention.