Is the property information sheet (TA6 form) legally binding

Just because there was no service fee due in September 2014 does not mean that the developer can't start charging one after that date.

Also, a bill for gardening etc isn't a "management" fee. It's a bill for a service provided. If the developer is simply passing on the costs of the service without taking a profit or surcharge then the developer isn't charging a management fee.

It might be worth getting an agreement to make it optional for the next buyer - e.g. "You can have your windows and gardens done for £x, or you can skip that if you want", since then it can be sold as an added extra for the property rather than a required fee.

By the sound of it, they've only provided one of the services (bins), and that seems like the kind of thing you could reasonably assume would carry no charge. The service which would carry a charge (windows), you refused, pointing out that you don't pay for it, and have had no response until this bill. Has any gardening been done which affects your property?

From what you've said, there doesn't appear to be any contract between you which would allow them to charge a fee, and your refusal of the window cleaning is a pretty good indication that you didn't intend for there to be one.

I would suggest pointing this out to them - perhaps offering to pay for that one time your windows were done, and a token amount for putting the bins out just to get this settled. Try to get something in writing that there's no obligation to pay on you or the next buyer (but as said, if there is the option for them getting garden/windows/bin done for a reasonable fee, you might be able to turn that in to a selling point).

Probably better to do this in writing rather than at a meeting - though if you're good at arguing in person, then the meeting might get things moving quicker (just be sure to send a summary of what was discussed to them afterwards, so you have a record in writing).

Something along the lines of:

"We do not believe that we owe any fee to you. When we purchased the property, we were specifically informed that there were no management or service fees (both in person, and on the enclosed TA6), and no indication of any such fees is present on any documents noting agreements between us and you.

Regarding the services on the invoice:

- The windows were cleaned once on (DATE). Following this, we informed you(/the cleaners) that as we did not pay a service fee, our windows should not be cleaned along with the rest of the properties. There were no further attempts made to clean the windows, and we were not informed at that point that you expected us to pay a service fee (either on a continuous basis, or for the mistaken cleaning of our windows).
- No gardening has been performed on our property. Any gardening on the leasehold properties is part of your maintenance of that property, and not our responsibility.
- We note that the bins have been taken out, but again we note that there was no prior agreement, and the bins alone would not justify the service charge.

We request a response in writing indicating that we are not liable for any service charges, and that anyone who buys our property will also not be liable. We can put you in touch with any buyer following exchange for separate negotiation if they wish to use those services. We will take out our own bins from now on."