Hi Kerry ... and welcome to the forum
Well, its pretty difficult to comment on what things may be like here in 3 years time. Obviously we are all hoping that the recession is most definitely over! but who knows!!
Given the length of time you have before you plan on moving over here, I would strongly recommend that you focus on learning the language. That in itself will increase your chances a thousand times of getting a job in Spain. Even without a recession, without the language your choices are severely limited.
If your partner is in the process of qualifying for a specific trade, its worth noting that his eventual qualifications may not translate over in Spain., Im no expert but I also believe that anything relating to electrics/maintenance can cause additional problems as the UK operates a different system to the one in Spain. Again, it is worth him taking some time to research the differences (if there are any) between UK and Spanish refrigeration/air con maintenance and installment etc.
Even with his new qualifications, and provided they are accepted in Spain, the language is a must! as he will be competing for work with native spanish speakers.
For yourself ..... It less a case of what jobs are available for English women - and more a case of what work is available for women who speak Spanish and English.
What is your previous experience work wise ? what do you enjoy doing ? and what do you want to do ?
I have no experience on child care costs - but Im sure one or two of my fellow forum members will comment on that when they see your post. But please bear in mind that 3 years is a long time and many things could change - good or bad in that time!
Focus on the spanish for now! and best of luck
Sue