The inner glass in the oven has come loose. Does anyone know of a glue/sealant which will stick it back in place....?

As far as I'm aware silicone sealant is good for stupidly high temperatures.
Stick 2 bits of metal together with it and cook them in a high temp oven to see how it holds up if you're unsure.:)

You can buy a silicone sealant specificaly for flue pipes which is rated up to 300 deg...this should do the job.

Mog

I used araldite on mine and was fine,but have since replaced oven and hob.

This is the one I used:

Specialist in Sealants, Mastic and Adhesive, Coloured Silicones, Bathroom, Heat & Fire Resistant (http://www.absealantsltd.com/sealants.htm#High%20Temperature)

I had 3 replacement window glasses (on warranty) and decided to stick it myself this time. Glad I did as its still good as new :)

Screwfix also do one . . . but I get cr@p delivery service from them because they insist on using Parcel Farce.

High Temperature Silicone 310ml - Screwfix Direct, Everything for the Trade, Next Day! (http://www.screwfix.com/app/sfd/cat/pro.jsp?cId=A436167&ts=18663&id=13185)

Local motorfactors, ask for timax exhaust paste...comes in a normal sealant tube. We seal flanges up with it that have 650 C going through them.