Specifically, I am wondering if it is common to bluff about a job offer in order to encourage a company I am interviewing with to make an offer sooner. What are some unforeseen consequences of doing this?
I have been interviewing with a company for over two months. They have openly told me that they are very interested in me and will most likely make an offer. They have also said that I am the first person to be hired at this office to fill a particular role, and that is why the hiring process is a little disorganized. Additionally, they have asked for me to notify them if I have any other offer deadlines to meet so that they can adjust their offer timing accordingly.
I am extremely interested in the position, and would like to avoid lying to a company I may work for. For personal reasons I need to leave my current position as soon as possible, but I do not feel comfortable putting in a letter of resignation until I have an offer for a new position. I do not have any offers from other companies; is bluffing about another offer a common strategy to speed up this process? Am I at risk of deterring the company from making an offer?
Edit: I am applying for a position in the US, but the main headquarters are in the UK. Also, I think I may have given the impression that I have just been waiting around with no information. I have had steady interviews and the company has been very punctual with feedback on the process. The problem is that the interviews seem to have no end in sight.