I've had an initial read of the NICE guidelines but they all seem geared towards first time mothers.
You need to read the right bit 
There is a whole chapter (Chapter 11 Pregnancy and childbirth after caesarean section) dedicated solely to the subject of VBAC v ELCS.
In the chapter it does a breakdown of the pros and cons before making recommendations.
The key recommendation in that section for you is:
Recommendation 119
When advising about the mode of birth after a previous CS consider:
•maternal preferences and priorities
•the risks and benefits of repeat CS
•the risks and benefits of planned vaginal birth after CS, including the risk of unplanned CS. [new 2011]
To make it very clear: When discussing a VBAC v ELCS NICE recommend that your preferences and priorities are a key part of that decision making process and should be taken seriously.
NICE appear to have recently changed their website, otherwise I would link to the document (In the full version of the document recommendation 119 can be found on page 195 - but it will be in the abbreviated version somewhere).
Chapter 5 about Planned Caesarean section which includes 5.9 Maternal request for CS, might read as if its more geared up for first time mothers due to the data being looked at being solely for first time mothers, however the recommendations at the end are aimed mostly at women who are suffering from anxiety over childbirth rather than first time OR subsequent pregnancies. The focus for women who already have had children is on women who make requests due to previous traumatic births which you may well not identify with. (Primary and Secondary tokophobia are both discussed).
There are however elements of the recommendations in this section which are useful to you in that they also back up recommendation 119 in saying that any woman who wants a CS should be given one, and if you consultant refuses to perform it, they should refer you to someone who will. This is on the basis, that regardless of whether you are suffering from severe anxiety over a VB or just have a preference, forcing you to have one against your will could damage your mental health.
So the guidelines are in your favour; you just need to know how to use them.
That said, in most cases, if you have already had a CS, you will have less trouble getting someone to agree to one than if you never have. You might get some pressure to have a VBAC, but it tends to be an easier process as its judged to be about physical issues rather than trying to prove mental health ones.
Hope things go your way, but you should get want you want in the end (although you technically are not entitled to an ELCS).