Golden Syrup does the same sought of job (90% sucrose)
Bat Guano from Oxfam .... (jah bless BeAn) :
... 8.00 quid a bag ,, some of the cash goes to charity!
Order took ages to arrive from here,nearly a week. Cheaper, faster service fromah yes - and harrodhorticultural.com do spider mite predators mail order - and they are a regular gardening shop!