I have a Leisure Alto fan oven element to fit and instead of screws it looks pins/rivets how do I change it

call a local repair service they can test it and fix , unless it is really Old

accessed from the back

That is complete RUBBISH the screws are accessible from the rear of the oven. At the back remove the screws holding the plate and you will see the element housing. Remove the two screws and the spade connections. Get someone to hold the new element in place for you and attached the screws. Fiddly job so be patient. Connect the spade connections and replace all plates front and rear. Should be the job!!! Someone hold the element in the cooker whilst someone connects at the back. Whatever you do, DON'T TAKE A DRILL TO YOUR COOKER!!

Hello,

It appears that the ring element for the oven has burnt out and will need replacing.

Hope this helped.

NEED NEW FAN OVEN ELEMENT THAT CAN BE FOUND HERE
You need Element code AB20 on link below
http://cookerandovenelement.co.uk/bellingfanovenelement.html

element is located on back wall of oven you need to pull oven oven to remove the element element is held by two nuts from back and i screw from front