ok ...update...sorry its took me a while as im busy moving shop to another location in the main shopping street in the town i live in !!! OPENING THIS SATURDAY...WOOOT!!
i received the replacement parts from henry and it corrected the problem....im not sure if it was the 10mm silicon matt on the bottom or the heat plate on the top...he sent both and i changed both....i suspect it was the heating element on the top though as ide obtained some silicon baking sheets, doubled them up to a thickness of about 6 mm and the problem was still there.
Henry kindly sent me a range of sample of his new sublimation blanks...ie mugs...zippos..caps..keyrings.
well i just thought ide update the thread as its important to keep you guys informed !!
THX FOR ALL YOUR SUPPORT AND HELP WITH THIS ONE...MUCH APPRECIATED
As soon as i replaced the heating element and the thick silicon base pad the problem was gone.