Yes, I think I may have contributed to this discussion. I was brought up to know that you always need to soak gaskets (time depends on material) before installation to get them back to size. Probably particularly the case for Landrover gaskets made in the UK and stored for some time in the Australian climate that is, by and large, a lot lower humidity. Actually probably doesn't make much difference where they are made, as any factory working with this sort of material should keep humidity fairly high to ensure the material remains flexible during manufacture.