Its tricky to answer. If you plan to stay in the house for a long time I'd probably go ASHP and ufh because I think gas is on its way out and the sooner you set up the house for a heat pump the better. Also ufh is great, nice even warmth, and no radiators taking up space.
For solar and batteries, I think (but not sure!) it's still difficult to get a return on the investment for the cost of the batteries over it's lifetime. Solar can be installed for a reasonable amount, especially if you negotiate with the installer and already have scaffolding up due to other building work. If you work from home, have a heat pump, or other high electric usage, installing solar is easy to justify and you should break even on the investment in half the life of the hardware (8-10 years into the 20 years life or so).
Our savings from going from LPG boiler to an ASHP were substantial but at the same time we did a full refurb with loads of insulation etc. so our LPG cost would probably have gone down anyway.
Pre-refurb we were spending about £2500 per year on elec and gas to run the house (some heating was also provided by normal electric heaters). After refurb I think our annual cost dropped to around £1200 plus we got about £300 from the FiT. The other big difference is that even when we spent £2500 per year, the house was not warm in the winter. Now it's lovely and comfortable. Impressive savings but it's really difficult to separate savings from the ASHP vs much better insulation.