I wouldn't call it paranoia.
If they have been "treating" with you on the basis of a certain set of facts (i.e. that they are called XYZ Limited and are based at 123 Any Street, Anytown, England, AN30 YTO) and the contract then arrives bearing different details, then there can't be said to have been a "meeting of minds" in relation to who the parties to the contract are. That could then call into question any clauses that rely upon one party having any expectation of the other - for example, you expect them to pay you but if the contract is not "met" in relation to who "them/they" are, you could find them being argumentative. The Court would likely side with you if it came to it - but you'd [possibly] have the devil's own job getting them into a courtroom - especially if they are already appearing to play fast and loose with facts like those.
If they have been "treating" with you on the basis of a certain set of facts (i.e. that they are called XYZ Limited and are based at 123 Any Street, Anytown, England, AN30 YTO) and the contract then arrives bearing different details, then there can't be said to have been a "meeting of minds" in relation to who the parties to the contract are. That could then call into question any clauses that rely upon one party having any expectation of the other - for example, you expect them to pay you but if the contract is not "met" in relation to who "them/they" are, you could find them being argumentative. The Court would likely side with you if it came to it - but you'd [possibly] have the devil's own job getting them into a courtroom - especially if they are already appearing to play fast and loose with facts like those.
Comment