Lets say SWIM makes 100% of their income from illicit bitcoins. What are some of the ways that person could cash into their bank account as legitimate money? Making a real web store that only accepts bitcoins, sending washed bitcoins into it, selling bitcoins and taxing them?
I would assume that a lot of vendors on LBC come into this problem. If you make under a certain about, £10,000 in the UK last time I checked, then you are usually fine.
However, lets say a legit BTC vendor buys some BTC, the price shoots up in a month and he resells them. I don't know how the bank would deal with that. I never made that much so I was fine in that department.
You could set up an online store, cash it out over a few months, that would work too. However if that bank gets suspicious they will report you. Bare that in mind.