Had a slow start here too, but the recent heatwave has really brought my plants on but still need a good few weeks of sun to ripen them up.
Are yours in a greenhouse Keith?
Climate and watering are key to a good crop, ideally temps shouldnt drop below 16C, impossible in Britain really, and over-watering slows growth. I always water fom the bottom which encourages the roots to grow down. Also I gently shake the plants a couple of times a day to help the plants polinate.