ABCDEFGHIJKLMNOPQRS
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Financial ConsiderationMonthly estimateSourceLinkNotes
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Housing (rent or mortgage)£1,200 – £2,200ONS private rental prices and

Rightmove rental trends
Index of Private Housing Rental Prices, UK - Office for National Statistics
https://www.rightmove.co.uk/press-centre/house-price-index/
London £1,800 – £2,200 ONS London rental inflation + Rightmove market averages
Manchester £1,200 – £1,600 ONS North West rental data + Rightmove
Leeds £1,100 – £1,500 ONS Yorkshire & Humber rental data
Birmingham £1,200 – £1,600 ONS West Midlands rental data
Newcastle £1,000 – £1,400 ONS North East rental data
Bristol
£1,400 – £1,800 ONS South West rental data

What the ONS actually gives us:
- av
erage rent increases by UK region
- not exact city rents


DERIVATION LOGIC
We take:


- regional ONS rental bands
- and apply midpoint estimates for 1–2 bed homes
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Household bills (energy, council tax, broadband)£350 – £600Ofgem energy price cap and
ONS household spending
https://www.ofgem.gov.uk/information-consumers/energy-advice-households/energy-price-cap-explained
https://www.ons.gov.uk/peoplepopulationandcommunity/personalandhouseholdfinances/expenditure
Ofgem (2026):

- energy cap ≈ ~£1,600–£1,800/year typical use ≈ £135–£150/month per household

BUT that is ONLY energy.

ONS shows additional household costs include:

- council tax
- water
- broadband
- mobile

DERIVATION LOGIC

-Energy (Ofgem 2026): ~£135–£150/month per household

-Council tax (typical Band D equivalent): ~£130–£170/month

-Water + broadband + mobile: ~£80–£140/month combined

-Total per household: ≈ £380–£420 minimum

- Multiply for realism (usage + variation): £400–£600 range
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Food and groceries£400 – £600ONS household expenditurehttps://www.ons.gov.uk/peoplepopulationandcommunity/personalandhouseholdfinances/expenditureLogic

- UK average household food spend
- Adjusted for inefficiency of two households

WHAT ONS ACTUALLY SHOWS

Average UK household food spend:

- varies ~£350–£500/month depending on household size

BUT:


- separated households often lose economies of scale

DERIVATION LOGIC

- Single household = ~£350–£500 baseline
- Separation = inefficiency uplift (~10–20%)

Adjusted:
£400–£600
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Transport£180 – £300ONS transport expenditurehttps://www.ons.gov.uk/peoplepopulationandcommunity/personalandhouseholdfinances/expenditureLogic

Includes:


- commuting duplication
- fuel/public transport
- household travel inefficiencies

DERIVATION
UK average per adult household transport:

~£150–£250 typical


Separation effect:
- duplication of commuting + household travel inefficiency

range uplift:
- £180–£300
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Childcare (where applicable)£200 – £800CORAM (Coram UK childcare cost ranges (region + age dependent, post-funded hours variation))https://www.coram.org.uk/resource/childcare-survey-2025/This is NOT universal — only applies where childcare is needed.

KEY REALITY (VERY IMPORTANT)

UK childcare is:

- highly variable
- heavily subsidised for eligible families
- regionally inconsistent

WHAT CORAM SHOWS
- nursery costs vary widely by region
- under-3 care is most expensive
- funded hours significantly reduce costs for many families


DERIVATION LOGIC

We are NOT saying: “average childcare cost”

We are saying: “where childcare is required post-separation”

So range reflects:

- part-time nursery usage
- after-school care
- mixed subsidy access
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Leisure & other discretionary spending (Per Household)£100 – £300ONS household expenditure (recreation + dining out categories)https://www.ons.gov.uk/peoplepopulationandcommunity/personalandhouseholdfinances/expenditureWe derive it like this:

ONS recreation + restaurants & hotels categories

Logic
- single household baseline spend
- partial duplication after separation
- NOT doubled
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Total estimated monthly cost£2,300 – £4,000+
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LOW CASE EXAMPLE
Housing: £1,100
Bills: £350
Food: £400
Transport: £180
Leisure: £100
= £2,130 – £2,600
HIGH CASE EXAMPLE
Housing: £2,200
Bills: £600
Food: £600
Transport: £300
Childcare: £800
Leisure: £300
= £3,800 – £4,000+
Illustrative modelling based on publicly available UK datasets including ONS, Ofgem and Coram estimates the potential cost of maintaining two separate households after separation
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