what boiler do i use to replace the potterton flamingo 40?

the boiler my house has is a wall mounted potterton flamingo 40, it must be about 15 years old and it's now been condemned. i need to know what boiler i will need to replace it. i can't afford to replace my pipes and raditors or take out my water tank so the new boiler has to be able to run with what i've got. i know the flamingo 40 is no longer manufactured. are there any boilers that are like the flamingo 40 that are available today? please help