If you are referring to some sort of difference between the market price and price published on the main page of our website, then I'd like to clarify it is not really a 3.5% spread. The price is not being refreshed 'live', so it may look like a spread. We are fixing the course based on the market rate (Kraken / Bitstamp).
Regarding GBP - since we are a relatively new player, it is highly unlikely that our company is on any of the UK bank radars. No issues reported so far. In addition to that, the details you would mention when making a wire are simply "pro forma invoice XXXXXX", there is no 'bitcoin' word or any other word that could trigger bank's filtering system.