Hi there C0206, I've never been "sought out" before - what fun!
I have a few hints and tips on how to lengthen your LP, which I can certainly pass on to you. First of all taking vitamin B6, 50mg to 200mg per day, should help. I have also read that taking a vitamin B-complex supplement alongside your B6 will make the B6 more effective.
The other main way to lengthen your LP is to use progesterone cream (ONLY post ovulation). Not sure how available this is in the UK - I got mine from the States.
Agnus Castus is also supposed to help, but do some research on this and know the side effects - it can work great for some women, but can also make things worse for others.
How are you measuring your LP? Via BBT? Once you have a few cycle's worth of data, consider consulting your GP - I first saw mine after only 3 months of TTC, and he was very supportive and sent me for blood tests right away (I'm close to 35, which may have accelerated things).
You may find some or all of these sites useful:
www.babyhopes.com/articles/luteal-phase-defect.html
preconception.com/resources/articles/lutealdefect.htm
co.essortment.com/whatislutealp_rlsv.htm
I found that taking the B6 supplement appeared to lengthen my LP by a couple of days, however we have since discovered, through further tests, that the problem seems to be that I am not ovulating at all, rather than a luteal phase defect.
Hope this is some help!
Hugs,
Artoo.