Will it be cost effective to replace my Central Heating Boiler?

Yes I had a Worcester Bosh 42KW Combi installed last year and recon I am saving �150 on the gas. They say its mostly saved because you heat the domestic water only when you require it and not storing the hot water every day to let it go cold. With a 42 kw boiler it gives 18lts per min. of very hot water and will fill a bath as fast as any standard tank system. Insulation is a very important thing now and you should look at possibly a grant certainly for loft insulation and in some cases the walls. I understand these can be dry lined with insulation board.