The five research councils are pushing forward a research agenda in mental health right now, for background information see here: http://www.rcuk.ac.uk/documents/documents/cross-disciplinary-mental-heal...
Two current calls include:
Global Challenges Research Fund: January 11th 2018
This is a joint AHRC/ESRC led call under the Global Challenges Research Fund and is seeking applications in the area of mental, neurological and substance abuse disorders, collaborating with ODA countries:
Cross-disciplinary Mental Health Network Plus: Deadline March 22nd 2018
This is a cross-Research Council call, the aim of which is to encourage the creation of multi-disciplinary networks that cross the remit boundaries of the research councils. These networks will address important mental health research questions that require an innovative, cross-disciplinary approach to accelerate progress, build cross-disciplinary research capacity in the field and strengthen the UK mental health research base:
http://www.esrc.ac.uk/funding/funding-opportunities/cross-disciplinary-m... also on the MRC https://www.mrc.ac.uk/funding/browse/mh-network-plus/cross-disciplinary-...
Further calls may be released in the future, I shall post them if they come through,
KellySocial Science Research Unit at UCL, London @Kelly_Dickson