Hmm. Sounds interesting. Two issues here - let's separate them.
1) Your manager has not been following through on commitments made to do certain things, and particularly not reviewing your performance in a reasonable manner. You could raise a grievance about this.
2) You have been told your job is being made redundant. if that is the case, then it is hard to see how there can be a situation where you are then being told to re-apply for the job. The principle of redundancy is that the job is made redundant because of a cessation or reduction in business activity. The employer then has to put the impacted individuals into a pool for selection, then show that it used a fair means to select from the pool. Please understand that what I have said is based on the evidence you have put in the very short Question you can ask on here - it may not be that simple - but it looks like it is worth pursuing.
Much depends on what outcome you'd like to achieve. That's face it, if an employer wants an employee out, it will usually manage to achieve it, and for senior roles it is often about how much luchar is required to get the person to go without making a noise. If you are happy to go and it is all about extracting the most money, then the potential negotiating power that you may have is:
a) I have a grievance I am about to start as per 1) above.
b) your selection pooling process appears flawed. if you keep going down this track I will resign and seek to claim constructive dismissal at an Employment Tribunal. That will cost you an awful lot of time to defend and just think about the bad publicity and impact on other staff.
b) above is a high risk strategy but might help extract much more money for you - but I do urge you to seek the advice of a solicitor who knows about employment law first. You need independent advice.