The charges laid on by Whittingtons are outrageous. They charge to send letters, to renew contracts, to use your credit card, for checking your guarantor - they even charge you to leave and wont release a landlords reference without a hefty payment (why its £24 PER PERSON even if you had a joint contract/tenancy at the same address with the same landlord and are moving to the same property I cannot rationalise, other than the greed of charging you more!). An estate agent I met recently also mentioned to me that they charged him as an agent for a landlords reference and were the only agency to ever do so in his experience. Seems Whittingtons might be making double bubble on these charges.
In the last 11 or so years I have rented around 8 different properties both in Worthing, Middlesex and London and I have NEVER encountered such horrendous, exploitative fees as this. If you can find your property listed with another agent, avoid Whittingtons.