White Knight Dryer 767C Cutting Out?

My White Knight 767 Condensing Tumble Drier keeps cutting out, I believe due to heat. After the problem started to occur, I ran a full cycle fine in an open room, but when placed back under the worktop it cut out after about 30 mins and then repeatedly cuts out after very short periods. Could this be a thermostat issue? Is it simple to replace? Are there any dissassembly instructions on the web anywhere? The reset switch does not appear to permanently solve the issue.