Negotiations after winning a grant
You want to ask some trusted people in your department whether such a grant would qualify as grounds to renegotiate your contract, as standards for this matter differ widely between universities and departments. Further, what exact grant you won matters much more than the sum - it's ultimately more about the reputation than about the money.

That said, my suspicion is that a 200k grant will not be a reasonable token for any serious renegotiation. While a very nice boost for a young lecturer, such grants are ultimately bread-and-butter for the university, not something that would trigger them to radically rethink your position and rank in the university. Usually, the only grants I see people occasionally use to renegotiate immediately are the top-level personal grants (ERC, or the respective national equivalents) - the type of grants that very few individuals in the entire university get, and which make a dean nervous that you might also get wooed by some other universities to leave and take your grant with you.