Pay debt (low APR) before mortgage application?

I am looking at applying for a mortgage in 6 months time (85% LTV). Most of my debts are on low APR's.

I currently have the following debts:

Card 1 - £2,100 (2.49%) - CL: £4,000
Card 2 - £1,500 (0%) - CL: £5,000
Card 3 - £0 (Argos Card) - CL: £750
Loan - £9705 (5.8%)

I am moving town, so would be looking for a CTL on current property, and buying second home (100-120k).

I can either pay off all the CC's before applying, or save this money and reduce my LTV to 80%. Would this level of debt be a problem for a married single applicant with 4 dependents (1 adult, 3 children).

Income 27k (excl Tax Credits etc)

Thanks