[euromodder]

Main question : do you plan on staying there for a long while ?

Originally Posted by 320touring

The burd and I have been in this house for just over a year and the heating/insulation could do with some work.

How old is it / when was it last remodelled ?

Mid Terrace

So you're locked in left and right ?
Good starting point - neighbours are good insulators ;-)

Front/Rear walls solid Sandstone, approx 20-24" thick
All Walls lined with Plaster

So you basically have 2 giant cold- or thermal bridges ...

Sandstone doesn't insulate well.
Depending on composition, it has 2 to 5 times the heat loss compared to brick.
The harder / heavier it is, the worst it is -lighter, softer sandstone traps lots of air.
The only saving grace is its thickness.
It gets worse when it gets wet - but just about everything does.

If you can / are allowed to , have it insulated from the outside.
It also changes the external appearance of the house.

You can do that on the inside, but it eats away at the useful space, and gets expensive quickly as you'd need to redo lots of the interior.

House is fully Double Glazed

Good, but OTOH, say 1980s double glazing isn't what double glazing is today.
It's also the most expensive to replace.

Bathroom- Tiled

If you ever remodel it, think about ditching the tiles for warmer materials.
Wood. Cork. Even plaster.

I've never understood tiles in bathrooms. They're ice cold.

Downstairs has a "crawl space" of approx 3ft underneath it with access

Get it insulated with 1' of insulation.
Still leaves 2' - plenty to crawl through.

Some companies are even filling the whole lot with PUR / PIR these days

Upstairs has space under of approx 350mm to ceilings of downstairs

You could insulate that, but you'll have heat losses from ground to first floor anyway. It's not really a loss as they help warm up the bedrooms.
Cork chips or paper could be blown in through a hole rather than ripping out the entire floor or ceiling.

Loft
No access apparent-think it's been sealed over-unknown if insulated

Heat losses through lofts are massive.
Check it out, get it insulated.
Even if it was insulated years ago, it may well be a good idea to add another layer of better insulation.

18yr Old Combi Boiler (holds pressure ok)

Running it at a lower temp is usually more efficient.

Rule of thumb used around here is that when it's about 20 years old, you'll benefit from replacing the heater - the new one pays itself in reduced heating cost.

Front room and Hall have "neo-classic" radiators (like old church Rads)
Bathroom/kitchen and both bedrooms have double panel Radiators with thermostats on each one

You can get more efficient radiators these days.

Insulate all visible pipes.
Pipes are inefficient as radiators.

A reflective liner on the wall behind the radiator helps too.

We also have big discrepancies in heat throughout the house- Warmest to coldest..
Small Bedroom
Kitchen
Living Room
Master Bedroom
Hall
Bathroom

serial set-up, rather than the current parallel distribution starting off a "common rail" at the heater ?