I hope MHRA carry out a very detailed analysis of the situation before issuing any further guidance.
I'm in my 40s and would much rather have the AZ vaccine (which has been administered to 18million+ people already - and millions more, if you include EU countries and Covishield in India) than the J&J, Novavax, Moderna etc which equates to starting the risk assessment all over again.
In terms of women's age, 30 is very different to 55 (if anything, due to the hormonal profile). Also younger women are more likely to be on the contraceptive pill and older women on any other medication or already suffering from autoimmune conditions.
Someone mentioned Pfizer and Israel upthread. It's not clear whether Israel will be inclined to report externally at this point such a small number of events in younger people, as their relationship with Pfizer is so strongly intertwined (nothing sinister, but they have exchanged doses for recipients'' data)
I agree with OpheliasCrayon in that a lot seems to be political and profit driven as the AZ vaccine is so cheap. Any issue needs to be investigated properly, but the amount of negative press it's receiving (while everything seems to be suspiciously quiet on all the other vaccines is ridiculous)