Yes, I managed to set up. Basically if you have any documentation and balances you can share. So I shared my new lending agreement and the money flowing into my current account to get the limit increased. Once I uploaded these documents it took a couple of days. This might be helpful:
Source of funds: Sale of Property
If you’ve sold a property and used the proceeds to top up your Revolut account, you’ll need to send us a copy of the sale contract for the property; a bank statement showing the proceeds of the sale being credited to your bank account; and a statement showing the funds being transferred to your Revolut account.
I did save about £500 vs. using Transfer wise in the end (which was my back up if I didn’t get the limit increase in time). So well worth the hassle of chasing to get the limit changed.
I did still end up breaking down my transfers to minimize credit exposure (and also because I have a £20k limit on daily transfer out of UK bank account). It’s still not clear how easy it is to get your money back if something happens to Revolut, even if its ringfenced with Barclays.