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Pellet boilers are not suitable for living areas - they are too noisy!
Thermal stores are a waste of time unless you are rich and can put a huge one in an outbuilding along with your log/pellet boiler.
If you want to install a solar thermal system, that actually works, is reliable, and will require a minimum of maintenance, then add 5k to whatever water storage system you decide upon. People will claim they DIY'd their own for less and that it works, but plenty also paid more for poor systems.
My heating is all wood, though my boiler/stove can take coal if necessary, and my dry stove/cooker could also (though it is not certified for coal). It is a faff, but I enjoy it. I particularly enjoy lighting fires, sharpening my axe and chainsaw, lugging large pieces of wood around, and splitting logs with my maul. This is just as well as wood is significantly more expensive than gas if you buy it.
A gas boiler is a no-brainer! If you have space for a hot water tank somewhere, and have decent water pressure in your area, then you will be amazed at the performance on an unvented cylinder. Otherwise go for a combi. Personally, I'd fit a tank if it is at all feasible.
If you have a flue (lining cost ~ 1.5k) or can fit a double walled stainless steel one (cost ~ quite a bit more) and a place for a dry stove (cost ~1k), and can afford delivered logs (cost ~ more per kWh than gas), then you can have a useful extra source of heating, which will also help keep your gas bill down!
T