The symbols on the control panel are all wearing

For that type access is normally by removing screws at the side.

Belling CFE60MFTC

https://www.google.com/search?q=Belling+cfe60mftc+replace+oven+control+Knob

..

Question edited for clarity.
Question moved from Kensington Computer category to Belling Kitchen Ranges.

'Access' in "how do I unlock it and press the buttons", or "how do I take is apart"?

There is some help in the link, or reach out to Belling Customer Care.

https://www.google.com/search?q=Belling+kensington+100e%2C+access+control+panel

..

This will fit your model:
Universal 4 Sided Oven Door Seal Kit

Probably. Speak with your propane supplier about what will need to be done with your stove.

Found this online - £101.99

Belling Stainless Steel Cooker Control Panel for DB90

http://www.espares.co.uk/part/cookers-and-hobs/belling/db90/p/1092/154/0/538873/547712/stainless-steel-cooker-co.html

It could also be the micro temp thermal fuse which cost about a £2.00 to replace and has to be fitted with crimps (NOT SOLDER). This is located behind the large back panel and should be replaced by a qualified Electrician.

main oven not working

Not easy. Briefly, in addition to the screws you mention, the cooker side panels need to be removed to give access to removal of the control panel side clamps. Then the indicator lamps have to be disconnected, and timer etc. buttons have to be pulled out to allow removal of the the control panel. Then the main control unit (timer etc.) needs to be unscrewed from behind the control panel.
Replacement is reversal of above.
Good luck!

they just pull out but need a fair bit of force