Ok, let's put it straight then.
You need to BUY one number in Bahrain and ONE number in UK. Buying this numbers is good, if you want people to call you to those number at local charge rate. If you have missus in Bahrain and this is only thing you want to phone there, you do not need to buy number for her, just call her for free (Skype to Skype connection is free). In UK - if one of your phones is your bussiness phone - it is worth to buy number, so people will call on this one for local charge. If you just need to communicate between those 3 uk numbers and 1 in Bahrain - it should be free of charge in Skype anyway And yea, you do not need phone if you have computer, just microphone and speakers or mic and headphones And installed Skype client