Push lid ( as shown in diagram ) until it moves back then lift lid.It can be very tight and can need a hard push.

Remove the four screws as shown in the picture to the left. Then remove the two screws at the top of the side panel as shown in picture below.

Remove the plynth by inserting a small flat bladed screwdriver in the 3 places as shown in the picture and slightly lift up to release the 3 clips (one at a time ) then the plynth can be released from the lower clips (The lower clips can be tight and soon break) .

Remove the 2 screws as shown in the picture ( some of the models have a screw underneath shown by the arrow).The side panel slides back and can be removed .

The insides can now be seen .Unplug the heater plug as shown in the picture . Remove any tie wraps towards the rear of the machine

Remove the screws from the heater cover (There are 2 small screws where the yellow circles are these hold the heater in place. DO NOT REMOVE ) . Then using a flat bladed driver prise the cover away from the rear panel to remove the heater cover and heater (mind the heater wires ).

The heater cover should look like this . Notice the fluff buildup on and around the elements . The fluff must either be removed very gently or a new heater fitted .