Just an observation - but I would get a proper plumber in to look at the system. Two reasons:
- you will then have a properly informed opinion of what needs to be done and the deficiencies of the current set up.
- you may find that as well as replacing the boiler etc, you may need to replace radiators and pipework. This would disrupti any decorating and/or new flooring you may now be doing
When I moved into my current house ~ 20 years ago the boiler was fairly new but the house was fitted with skirting radiators. Thses are both inefficient and (more importantly) were on a single circuit rather than feed and return. Replacing these meant pulling up floors for all new pipework!
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TRVs new
TRVs new