Quite possible it can be replaced via the oven cavity (isolate the appliance before attempting to). It depends on the oven construction.
Google < si4854pix fan element how to replace > to find you tube videos from spare parts sellers.
https://www.hotpoint.co.uk/spare-parts/bom/si4854pix-759990968000 has the exploded diagram and parts numbers for it.
Google < si4854pix fan element how to replace > to find you tube videos from spare parts sellers.
https://www.hotpoint.co.uk/spare-parts/bom/si4854pix-759990968000 has the exploded diagram and parts numbers for it.