We present 850 \mu m imaging polarimetry of two high-mass star forming regions – W48 and S152 .
Within these regions we have identified two candidate high-mass protostellar objects – W48W and S152SE .
The submillimetre continuum emission from the candidate HMPOs is bright in comparison to the nearby H ii regions .
W48W is a cold dense source , with no radio or mid-infrared emission .
S152SE has an IRAS source IRAS 22566 +5828 in the Southwestern part of the region , which appears in the mid-infrared 8.28 \mu m emission , but there is no radio emission .
The 850 \mu m data shows another core within the region , in the Northeast .
The polarimetry is ordered and the degree of polarisation is high over the candidate HMPOs – \sim 6 \% for W48W and \sim 8 \% for S152SE .
Polarimetry results of this nature indicate a strong , ordered magnetic field threading the candidate HMPOs .
The magnetic field direction in both S152SE and W48W is perpendicular to the direction of elongation of the cloud which would imply collapse along the field lines .
Estimates of the magnetic field strength are derived using the Chandrasekhar & Fermi method .
We calculate plane of the sky field strengths of \sim 0.7 mG for W48W and \sim 0.2 mG for S152SE .
We discuss the drawbacks of using the Chandrasekhar & Fermi method with a large beam size .
Mass-to-flux ratios have been calculated and both clouds are found to be roughly critical .