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GasSim 2.5 was launched in 2012.

The Environment Agency now expects gas risk assessments to be completed using GasSim 2.5

You are free to continue to use GasSim 2 under the terms of the GasSim 2 Licensing Agreement beyond the date of withdrawal of help desk support, although we recommend that all GasSim 2 users convert to GasSim 2.5 (at no cost).