From the Brian Eno FaceBook page:
"As a result of the Brexit-related fall in value of the British pound Apple have increased the prices of all apps sold in the UK by 25%. While we always intended REFLECTION to be a premium priced app, we feel this increase makes it too expensive, so we will take the hit in order to keep the British price to the consumer at its original level.
In other territories this decision will translate into a reduced price for the app.
As a thank you to anyone who has paid the higher original price for the app, we are making available a free download of a new piece of music created with similar algorithms to those in Reflection. This will be available to anyone who has purchased the app to date and will be available to download until 28th February."