@flipper1973 These pics aint great to be honest mate so i wouldn't want to make a set diagnosis, but there are some colours on the buds there that concern me. Can you get a better pic?
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Fortunately, I have not had to deal with any bud rot (knock on wood). However, I am sure someone who knows better will chime in as soon as they can. I’m posting to bum your post up. Also, could you tell us about your RH and airflow? Bon chance, mate!
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@flipper1973 Looks ok mate, but I would still keep a close eye on it. There are some grey patches but that may be down to the colour of the leaves and not rot. Just keep a close eye on it over the next couple of days and see if it gets any "greyer". But I dont see any definite signs of mould at this point 
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Thanks hopefully heat stress fingers crossed
Looks like its very humid in the grow room though? What kind of humidity levels you hitting? Make sure there is plenty of air flow and extraction
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@im_sparky she has been outside all her life but had to go away for a few days so put her in my tent have fans on top and bottom so should be plenty airflow I'm hoping I put light a bit close to her 
Looking at the peteol of the leaf coming out of the left of the nug. You can see that part of it is actually starting too die. Deffo a chance you do have a small amount of rot in there unfortunately bro. Another option to do would be Bag the bud/cut it off in the bag so no spores spread. Take it somewhere away from your plants and look inside. Worst case it is. If it's not you got an early taster
A tell tale sign of rot is the smell, if it smells like an old musty gym bag then most likely it will be rot. It looks mighty close to being ready from that picture anyway, I would take that nug off and have a proper look, but from that picture it looks more like end of life than bud rot.
I feel like a, like a slice of butter... melting on top of a big-ol' pile of flapjacks... yeah.
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