General maintenance
If the weather is warm, you may need to start mow. Set the cutting height at its maximum, and only mow when the grass is dry.
Re-cut lawn edges to crisp up the appearance of the garden and save work later in the season.
Turf can be laid, provided the soil is not too wet or frosty. Work from planks, to avoid compacting the soil. Do not walk on the newly laid turf and leave undisturbed for several weeks to allow new roots to establish.
Prepare seed beds for new lawns to be seeded later in the spring, but only attempt this if the ground is not too wet.
Troubleshooting
Continue to look out for moles. Their activity increases in February, as this is the mating and nest (fortress) building season. Remove the largest hills and re-firm the ground before overseeding with grass seed in spring.
Keep brushing away worm casts, as they can be troublesome at this time of year.
Fusarium patch, or snow mould, and algae may continue to be a problem.