Hello Den sorry for the delay, its been a little hectic of late, but here goes....First of all your residents certificate has no end date.
I wihs the matter of SIPS was as simple, There seems to be no standard procedure and you may have to keep renewing indefinitely even though you have a permanent SIP card. My family and I have permanent cards but we were issued with these over 4 years ago and as I pay social security this could be why!
Next time I go to Orihuela I will certainly check out why this happens as I have clients who are in the same position as you and have to keep renewing and although they have no problems, it is a pain!
Sounds like you have everything covered!
You can also (in Orihuela) apply for reciprocal European Health Insurance cards from Spain and these last a year, look the same as the ones from the UK but say Spain. Somtimes these are issued automatically, sometimes you have to ask!
However even though I have these, I took a friend of mine who is not retired but covered by the E106 ( 6 monthly renewals at the moment) and she was told you dont need this you can use the E106 and the one from the UK, however we are investigating this as I am not convinced!