Hi Evecob, I am not a solicitor but here are my thoughts:
A seller's solicitor is always agreeable to get to exchange without sorting out issues - if a buyer's solicitor allows it! It is up to the buyer's solicitor to do the due diligence on the purchase, after all if they don't do it correctly, you will be knocking on their door in a few years wanting to know why they allowed you to proceed without explaining what you were getting into.
Your solicitor is on your side and is acting in your best interests. Sorry to say, but you were never in a position to complete today while this enquiry was outstanding.
If you are buying a property on which there is an estate rent charge you should take the advice of your solicitor, as it can affect the value and marketability of the property.
An estate rent charge is usually registered against a property as a way of ensuring that property owners observe a positive obligation related to their property ownership.
For example, an obligation to pay towards the costs of the maintenance and repair of the communal areas on a housing estate could be secured by an estate rent charge.
The problem with estate rent charges for property owners is that there is no procedure for challenging the sums requested under a rent charge, other than through the court.
In addition, the owner of the rent charge, i.e. the person with the benefit of it, can take possession of the property in the event that any sums due under the estate rent charge remain unpaid for 40 days.
This means that lenders may not be willing to lend on a property with an estate rent charge, because of the risk that the rent charge owner takes possession of the property if the borrower does not pay the estate rent charge. If this happens, the lender's security would be compromised.
Your solicitor needs to find out if there is any way to vary the estate rent charge to make it more acceptable to lenders.
An alternative way of ensuring that the obligation to pay towards any communal costs is secured is requiring property owners to enter into a Deed of Covenant, where they covenant to pay the charges due and future owners can be compelled to enter into similar deeds by entering a restriction at the land registry.
I am not sure whether modern Estate Rent Charges can be removed from the title, though I believe older rent charges (before 1977) will be "redeemed" in 2037, but this does not apply to Estate Rent Charges that are more recent.
You state that there is no restriction on your title, but is there something on the title regarding the rent charge? If so, could you quote the exact wording? If there is nothing on the title regarding the rent charge, how does your solicitor know about it?
If the rent charge cannot be removed, then a Deed of Covenant might be the way to go.
Sorry, I can't be of any further help, just to say that, although it must be so frustrating for you, it is of the utmost important that this is sorted out to your solicitor's satisfaction. You do not want to have problems regarding this when you come to sell in the future.