Cavity wall insulation. Will this cause damp?

We have a 90's house and were surprised that although we have cavity wall insulation in places, this does not go throughout the walls. We were thinking of having cavity wall insulation (beads), but are worried that the existing insulation will cause problems with the beads and lead to damp. Could you please... show more We have a 90's house and were surprised that although we have cavity wall insulation in places, this does not go throughout the walls. We were thinking of having cavity wall insulation (beads), but are worried that the existing insulation will cause problems with the beads and lead to damp. Could you please advise. The house is very cold in the winter and our heating bills are high
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