Need to know what is the best bundle to buy to my 20 years old boiler and cylinder

@Omar0 The question is: What are you trying to achieve and what's your budget? ... Remote control? Energy/cost savings? Comfort? Reliability? Floor space for a new kitchen? Assuming a typical S-Plan or Y-plan setup, possible options:

1. The Potterton Kingfisher MF is a non-condensing boiler, about 80% efficient. It should have an external bypass on the pipework. A new condensing boiler is 92% efficient and should save circa 13% on gas consumption. A 'typical' ofgem household would save around £110 a year at 2024 prices. A Gas Safe engineer job and not ££cheap.
2. The Tado wireless starter kit will replace your Honeywell controls and room stat. That would give you a flexible smart schedule for CH and HW from your phone/tablet/PC. £85 on offer at Screwfix. A relatively a simple option for a competent DIYer. Any savings would depend on your personal circumstances and how you use it.
3. Dumb TRVs. You'll need a plumber or heating engineer to change to thermostatic valves on the rads. Need to keep one rad without a TRV as the Potterton boiler bypass.
4. Tado TRVs. You could add these after doing 3. On offer around £180 for 4 at Screwfix.

Personally, I'd start the list with 2. The Tado wireless starter kit to control your CH and HW schedule. Best return for the least ££ invested.

A close second would be 3. Add 8 dumb TRVs for more comfort. Keep one rad or towel rail open as your Potterton boiler bypass.

Third is 4. Add up to 8 Tado TRVs. You could do these individually as your budget allows.

Last would be 1. Make a plan for replacing the old Potterton boiler sooner rather than later.