Toilet seems to be getting worse! When flushed it fills with water about half way, firstly quite fast water flow then this slows to a trickle and then stops, no where near full enough for a good flush.

We are now pressing the float part to fill it a bit higher. The flush handle is also a bit loose so we tightened this, now making it difficult to flush.
Do I need to call a plumber or can we DIY it? Many thanks.

You do not need a plumber for this. Does the water level even get close the floating the float or is the float hanging in the air?

The float is in the water. Thank u for replying but I think it's sorted after hours of googling. We adjusted a screw to get the full level higher or something! Saved us calling anyone out.

Is the tank level about a half an inch below the white overflow tube? If not, then click on back and I'll give you directions on how to set the level. Back to you, Tom