I keep an eye on the easyJet BRS-EDI-BRS fares because I use the service from time to time and can book well in advance so get the best fares (for me, if not for the airline!).
In recent months the cheapest fare has invariably been £6.99 each way giving a toal of £13.98. However, you have to add to this a total of £22 for taxes and charges giving an overall fare for BRS-EDI-BRS of £35.98.
Since the weekend I have tried various combinations of dates but the cheapest one way fare (in either direction) I can find is £12.99.
I 'test booked' a couple of these dates and came up with a total of £25.98 for the basic fare (£12.99 x 2). However, the taxes and charges are now only £10 so the result is a total fare for BRS-EDI-BRS of £35.98, exactly the same as it was before.
So it seems that easyJet is quoting a more realistic fare 'up front' with the tax/charges element reduced.