So, aside from the C3 item with no description, you appear to have a few issues that need attention.
Metal faceplates with no earth
Non-IP rated downlights in Zone 2 (although you should measure your ceiling height and check whether it's less than 2.25m - if it is, you should look to improve it, if not then it's up to you, but being sensible, IP rated downlights in a bathroom would be an improvement)
No supplementary bonding
A fault with your oven
Possible solutions:-
Metal faceplates with no earth - If you want to be safe, have them changed for plastic face plates or have them checked to see if there is a CPC available. On a report, some people just report, others fix minor issues... it could be the CPCs are there and just need connecting (personally I would have just connected them and mentioned it as a note on the report if there weren't too many of them)
Non-IP rated downlights - Check the ceiling height and take it from there
No supplementary bonding - You could have supplementary bonding added or alternatively (if they'll fit) have the two lighting circuits circuit breakers changed to RCBOs, which would then provide the required RCD protection and render the lack of supplementary bonding a non-issue
Oven fault - Have the fault investigated by a spark with the right test gear
My advice is, get a spark in to have a look at these issues and give you a quote for sorting them out. If you asked me to do it, the solutions I've outlined above would be my initial thoughts. As
@Murdoch suggests, try and get a recommendation for a spark from family, friends or colleagues.