Clicon, please make sure your information is accurate in the public forum. That might be the correct part for your machine but it is not the listed part for the OPs (original posters) dishwasher. Erm.....yes I think you'll find it is. The OP's model is a SGS3042GB/03 just like mine and the link takes you to the instantaneous water heater for that model. Furthermore the part you quoted him 264512 only fits SGS3042GB/01. Please, correct me if I'm wrong.You may very well find that the element is the same inside but there are other parts fitted to the whole unit that will not be. these may then cause danger and/or expensive and irrepairable damage to the electronics. As mentioned previously, they are supplied as a "whole unit" for a reason. by unclipping them and refitting the element not only do you run the risk of a leak, you may as well fit the new ntc and diverter motor *if fitted* as the diverter motors have been known to fail and take out the electronics.
Please also remember just because you have solved your problem sucessfully, it does not always mean it is the only solution. £70 for an element is a lot of money to spend if its not actually faulty, or if its damaged the electronics too. hence my advice to get it checked out first. its very likely it is the element but speaking as an engineer i wouldnt order one in just on hte hunch it had failed.
moreton it would help if you have a friend who is an electrician to do an insulation test on the element in return for a couple of beers, and as previously stated, if you feel confident enough, visually check the pcb for damage too, before ordering parts.