Just two things really, ID and address proof. Uploaded my passport for the ID part, though a driving license works too if that's easier to grab. For address proof, a recent bank statement or utility bill did the job, needed to be dated within the last three months. Full list of accepted document types is laid out clearly on winplace-gb.co.uk under the verification section, helped me know exactly what to upload before starting. Whole process took about a day to get approved once both documents were submitted, no back and forth needed. Photos taken on my phone were accepted just fine, didn't need scanned copies or anything fancy. Pretty painless overall, much quicker than I expected going in. Simple steps to follow, made the whole thing stress free