Note
Went and saw a new physio today at Wakefield Hospital sports injury centre. He was really good and spent over an hour with me trying to get to the bottom of the issue. He thinks it is most likely related to my hip joint (pain in the groin and front of the joint plus clicking in the joint led to this new diagnosis) and this weak joint has triggered the piriformis tightness. He has prescribed NO RUNNING for two weeks and several strengthing exercises designed to target a deep muscle that supports the hip joint as well as the usual hip flexors and outer glutes. After 2 weeks, if my hip is feeling better, I can start gentle running again and see how it goes. If it's not feeling better, more rest and possible scans, etc.
Luckily, he thinks cycling to and from work might be ok, so long as I stick to roads and remove my cleats if my hip is still irritated after riding. Also I'm not to over do it and ride heaps - too and from work plus a few extra short rides is all. So, in true female fashion, to make myself feel better I've got my purse out and spent money - I've bought a gym membership! Think I might do some pilates and resistance classes while everyone else is out running... *sniff*