Mine took 14 days to come thru. I tried everything. The best solution was to practice completing the form to make sure I filled it correctly. Photo with white background and size etc. also check that when the passport is read misreading has not crept in. If all was good do not submit and wait. If thy do indeed need further documentation wait for e mail. If not wait a little longer mine came on the last day. I tried an e mail to uk visa office that might have helped in the end believe it’s down to them. Good luck
2.apply for CofE and upload medical ins, vaccination proof, passport cpy and visa cpy.
Wait for PreApproval
3 book flights and hotel( u may need to send hotel pp copy and ins copy. Wait for hotel confirmation cert and upload to c of e and submit. After approval print off cofe and book COVID PCR test. Check cov test has Fit to fly cert issued with date and time. Then ur good to go.
If my application fails (probably because I screen shot everything) then I think I will go for 45 day visa exemption and then try to extend 30 days but then have to change flight dates if possible