1 INTRODUCTION
2 THE SAMPLE
2.1 The IRDC sample
2.2 The MYSO sample
2.3 Distances, core masses, bolometric luminosities and infrared ratios
3 OBSERVATIONS
3.1 Observational information
3.2 Performance of the array
4 RESULTS
5 ANALYSIS
5.1 IRDCs and their radio evolution
5.2 Radio luminosity against bolometric luminosity
5.3 Evolution and relationship of jets and shock-ionised lobes
5.4 Spectral indices and dust contribution
5.5 Mass loss and accretion
5.6 Jets and molecular outflows
5.7 Measured sizes and implications
6 SUMMARY AND CONCLUSIONS