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Thanks for your replies.
Mother-in-law has now dedcided on further up the coast - Cabo Roig area and we've narrowed it down to 2 villas bit we're still looking at a villa at Playa Paraiso just off La Manga Strip but think it might be too quiet for the children there.
The three websites we always use are Holiday Rentals, Holiday Lettings and Owners Direct, we've used them for our past 4 holidays but as we have never been to this part of Spain before we're not sure what the areas are like.
I'm sure we'll enjoy wherever we end up - the weather is sure to be better than at home!!