A SPIKE in the three-month Singapore interbank offered rate (Sibor) may spell higher housing loan rates for some, but mortgage experts say there is no cause for worry given the low base enjoyed by home owners for the past few months. The benchmark Sibor, the rate at which banks lend to each other, for three months fell as low as 1 per cent in August. Amid recent financial turbulence, it soared from 1.76...