what can i do about wormcasts

Nothing, just be pleased. If they're dry, you can brush them across the grass - if they're wet and there's loads of them, scoop 'em up with a trowel and place on your borders. Casts on the lawn means the worms are aerating it as they go, and depositing a rich source of nutrients in the form of their casts. Won't be a problem as the weather warms up, they're only troublesome during early spring and in autumn.

Thank you for your answer, just wondering how Bowling greens, cricket pitches and soccer pitches escape this problem.

They have access to chemicals the rest of us are not allowed to use, but even they have had to alter what they use to some extent. Our earthworms are at risk, numbers are falling, so encouragement's what's needed! You won't be having a problem later - in the south, we've a hosepipe ban starting in April - soil's damp currently, but it won't take long to dry out, and without excessive rain, unless you live in Scotland or the North East of England or Wales, you may well be affected as time goes on.