FIXED IT!!!
SOLUTION FOLLOWS.
Before any electrical work turn off power at fuseboard and switch.
Hi the answer for this (i did it today) is replace the thermal fuse, you can buy a replacement from maplin for 89p.
i found the fault as there was black soot around the vent on the right hand oven side which i believe was the cause as some fat overheated causing the fuse to break.
(the right oven,hot plate and igniter were not working)
i did a continuity test on the brown live wire and also the blue neutral wire between incomer and right oven switch connection, i got a reading for the neutral but nothing for the live so- followed the brown wire back and i noticed it goes from the incomer round the front of cooker near timer then loops down behind the right oven ( left hand side from the back)( the fuse is located behind the bottom left panel- right hand side on the brown wire) and i saw some clear plastic covering a thermal fuse, so i re did the test from incomer to the first side if fuse got a good reading, then moved the second end to after the fuse and bad reading, then got a good reading between fuse and cooker switch, then tested the fuse on each end bad reading, so i snipped the fuse out remembering which was round it was! - colour pointing to the cooker switch, replaced with a new fuse the same rating (don't forget crimps)*. Turned power back on and bam all power restored, so turned power back off put electricians tape around the fuse ,put the back panel back on,
DONT FORGET turn cooker off at switch and at fuseboard before taking cover off!
Saved me around £130
(google thermal fuse to see what they look like)
http://www.maplin.co.uk/search?text=thermal+fuse&x=0&y=0
andy
December 2013