I always make the point to customers, that changing the boiler to a newer, and therefore less reliable boiler isn't always the way forward.
In your case, let's for argument sake say it will cost you £2k to change your boiler, it will take an awful long time to recoup that outlay, when your new boiler will still be using gas, albeit a little less.
£2k buys a lot of gas.
Your old boiler will probably go for another 10yrs, by which time you may decide to move house, and save yourself a load of money.
A good many new boilers are getting tired after 10yrs, and may require expensive parts, or replacement.
Only my opinion as an installer, no offence meant to others.
In your case, let's for argument sake say it will cost you £2k to change your boiler, it will take an awful long time to recoup that outlay, when your new boiler will still be using gas, albeit a little less.
£2k buys a lot of gas.
Your old boiler will probably go for another 10yrs, by which time you may decide to move house, and save yourself a load of money.
A good many new boilers are getting tired after 10yrs, and may require expensive parts, or replacement.
Only my opinion as an installer, no offence meant to others.