Banging in pipes

[Tim2k9]

So recently, over the last couple of days, when we flush the toilet the pipes seem to rattle as it is been filled back up.

There's also been a slight leak in the bath tap for a while, which seems to get worse when the toilet is flushed.

Any idea or is it time for a plumber?

[Tim2k9]

Haven't fitted a new ballcock, would this be the first place to look and fit a new one?