Based on my experience as a trader and after reviewing the relevant details for NatWest Markets, I exercise significant caution due to the broker's current regulatory situation. According to the information available, NatWest Markets does not hold valid regulation from the UK's Financial Conduct Authority or other key oversight bodies. In my own due diligence, I’ve learned that with firms lacking robust licensing, processes such as withdrawals can sometimes involve higher documentation scrutiny. While there is no explicit listing of withdrawal documentation for NatWest Markets, based on industry standards and given the broker's unregulated status, I would expect to be asked for proof of identity (such as a government-issued passport or driver’s license), proof of residential address (utility bill or bank statement), and potentially documents verifying the source of funds. These requirements are in place across reputable firms to meet anti-money laundering standards, but with NatWest Markets, the lack of clear regulatory guidelines may leave requirements ambiguous and subject to discretionary change. For me, this creates concern, as clear and consistent withdrawal procedures are a mark of trustworthy brokers. Without solid regulatory oversight, it is essential to proceed conservatively, maintain meticulous records, and be prepared for additional verification steps. I personally would be cautious and consider the risks involved before initiating any withdrawals or submitting sensitive documents to a broker facing high-risk markers and a lack of regulatory protection.