What exactly did that less than £250 get your customers in return?
Even if you had a business that was whiter than white in terms of compliance with previous data protection laws and had perfect documentation of all its data collection and processing activities, it would surely cost far more than that just for the time to write some basic notes on the extra things you now have to tell data subjects and/or your regulator, get them reviewed by a lawyer, incorporate them into the relevant policies, and send notifications to anyone affected about your updated privacy policy.
Even if you had a business that was whiter than white in terms of compliance with previous data protection laws and had perfect documentation of all its data collection and processing activities, it would surely cost far more than that just for the time to write some basic notes on the extra things you now have to tell data subjects and/or your regulator, get them reviewed by a lawyer, incorporate them into the relevant policies, and send notifications to anyone affected about your updated privacy policy.