Out of curiosity was there anything in the t and c's of the season ticket plus parking purchase which stated that the club retained the right (or words to that effect) to change or add anything without notice? Personally i wouldn't have bought a season ticket plus parking if there were no terms and conditions available at the time but i am aware some people would have had no choice due to disability/health issues and needed to be parked within a short distance.
For anyone who is willing to walk approx. half a mile and hasn't committed to a Ricoh car park there is £5 parking available at The Cherry Tree, The Hub, The Parkgate, Christ The King and Finbarrs etc