How do I replace bulb in oven? Stoves el716 what is bulb part order number?

In most ovens, move the metal bracket to one side. the glass dome cover should fall out. Unscrew the old bulb. Screw in the new bulb. Place the glass dome cover back over the bulb. Move the metal bracket to hold on the glass dome cover. Easy job to do.

SPRAY IN PRODUCT LIKE NUT BUSTER, OR PENETRATING SOLVENT WD40. WITH SMALL SCREWDRIVER GIVE A QUICK TAP WITH HAMMER. IT SHOULD LOOSEN UP JUST ENOUGH GRAB WITH A NEEDLE NOSE PLYERS AND TURN LEFTY LOOSY /RIGHTY TIGHTY. GO IN CORRECT DIRECTION!!

STOVES n600 is a squair glass window which prizes our from the bottom. It looks simetrical but only goes back in one way up

I can only say for the 720. You have to remove the whole oven from the kitchen furniture and then unscrew/remove the top and side panels. You will then see the springs on either side of the door.
Important. Remove the inner glass panel from the door first, before you release the springs.
To remove the springs, ensure the door is closed and then unhook them. You then should be able to remove the door frame.

Well, you can try STOVES and see what they will charge, and/or try espares. Once you have the part number, google that to see if anyone else can supply.
You may want to think about replacing both hinges and the springs at the same time, to ensure the door works/closes properly. Also, check the rubber seal round the door, then tend to become brittle when at the end of their service life, so it may pay to include that with the order as well.

The lenses have to be removed to gain access to the bulbs. If you look carefully at the lense, the edge immediately in front of you will have a small lip that you can get a screwdriver blade under. do so and twist the blade carefully and the lense should just spring clear. Note that the lenses have cut outs on them to ensure clearance on the bulb, so replace them round the right way.
Oven bulbs are all the same quality, so as long as you buy an oven bulb and it is the same physical size and fitting (BC or SES), you should be ok.

I have a Stoves Newhome EL716 double electric oven and last night, it just lost all power and stopped working - no grill, oven, lights, clock or anything. Can anyone tell me what this could be please? Thank you.

You should have a glass cover over the bulb itself. It may either screw on or it may have 2 or 3 screws at the base of the glass to take out. Then you should be able to unscrew the bulb as you would any other light bulb in your house. You will want to replace it with another appliance bulb 40 watt. If you have another type bulb or set up in your oven let me know and we will work through it.