Authorised by the FCA
This firm is on the FCA register and authorised to carry out regulated activities.
Website, phone number and address
Compare these against whatever you were given. Scammers clone real firm names and reference numbers but use their own phone number and website, so a detail that does not match the register is the clearest warning sign there is.
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No website on the FCA register
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Phone number
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Address
8 - 10 Hill Street, Hill Street, London, W1J 5NG, United Kingdom
In the full report: 2 background checks
- What kind of line 07713 165449 is
- Who else gives the postcode W1J 5NG
FCA permissions and consumer protection
- Give regulated advice FSCS may applyA claim for unsuitable advice is itself FSCS-protected, up to the limit that applies to the product you were advised on.
- Manage or trade investments · Run or oversee funds FSCS may applyEligible investment and pension claims are typically FSCS-protected up to £85,000 per person, depending on the product and your circumstances.
- Complaints Ombudsman, freeYou can refer a complaint about this firm to the Financial Ombudsman Service for free, whichever activity it relates to.
Show FCA detail (7 permissions)
- Advising on investments (except on Pension Transfers and Pension Opt Outs)
- Advising on P2P agreements
- Arranging (bringing about) deals in investments
- Dealing in investments as agent
- Making arrangements with a view to transactions in investments
- Managing an unauthorised AIF
- Managing investments
Limits on what they may do
- This firm may handle your money in passing but must not hold it, so payments should go to the product provider, never to a personal account.
One supervisory condition set by the FCA
These are conditions the FCA places on the firm itself, covering things like capital it must hold and what it must report. They do not change what the firm may do for you.
- Small Authorised UK AIFM (Sub-Threshold)
The total value of assets under management by the firm must not exceed the relevant threshold as set out in Article 3(2) of AIFMD (as determined under Chapter II, section I of the AIFMD level 2 regulation). In the event that the relevant threshold is breached, the firm must submit an application for authorisation as a Full-scope UK AIFM to the FCA
FCA disciplinary action and complaints
No FCA disciplinary action.
The Financial Ombudsman Service only publishes complaint figures for firms with 30 or more new complaints in six months, so there are none here for this firm.
Companies House record
The company behind the firm: its status, age, registered office and directors.
Concerns on the company record
- Accounts are overdue at Companies House.
- Company number
- OC371629 (opens Companies House in a new tab)
- Company status
- Active
- Company type
- Limited liability partnership
- Incorporated
- 19 January 2012 (14 years old)
- Registered office
- 8 - 10 Hill Street Hill Street, London, W1J 5NG, England
Directors and company secretaries
| Name | Role | Born | Appointed | Other companies |
|---|---|---|---|---|
| Guy Stuart Mitchinson | LLP designated member | Aug 1978 | 19 Jan 2012 | 1 other company |
Other companies run by its director
A firm is run by people, and their other companies are their track record: what they built, what closed, and anything that failed. It is the check most people never think to make.
- other company
- 1
- closed down
- 1
In the full report: all 1 company, named
- What each company does, and whether it is still trading
- Which of its director sits on each board, and since when
- Any that went into liquidation or administration
- All 9 people who have ever been directors, with their dates
Key dates in its history
Castilium Capital’s history from the FCA register and Companies House, newest first.
2026
18 January 2026
- Arnold E Amstutz stopped being a part-owner
- Michael Neff stopped being a part-owner
Companies House
2016
24 July 2016
- Arnold E Amstutz became a part-owner (25–50% of shares)
- Guy Stuart Mitchinson became a part-owner (25–50% of shares)
- Michael Neff became a part-owner (25–50% of shares)
Companies House
2014
28 October 2014
- FCA imposed a requirement (Small Authorised UK AIFM (Sub-Threshold))
FCA register
2013
1 April 2013
- Regulated by the FCA from this date
FCA register
2012
7 August 2012
- FCA imposed a requirement (May control but not hold client money)
- Became authorised by the FCA
FCA register
6 August 2012
- Regulated by the Financial Services Authority from this date
FCA register
19 January 2012
- Incorporated at Companies House
Companies House
In the full report: all 29 events
- All 29 events in its history (11 shown here)
- Every director appointment and resignation: 15
Firms like Castilium Capital
Other firms of the same type (investment or fund manager), nearest first.
In London
Firms are listed by type and location, best known first. Being listed is not a recommendation: check any firm before you deal with it.
Get the full report on Castilium Capital
Everything on this page, plus everything locked above, in one dated PDF you can keep, file or send on.
- 1 other company its directors have run, named
- 2 background checks on its contact details
- All 29 events in its history
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Frequently asked questions about this firm
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Sources and links
- Its entry on the FCA register register.fca.org.uk
- Its Companies House record gov.uk
- Check your FSCS cover fscs.org.uk
- Complaints the Financial Ombudsman Service can help with financial-ombudsman.org.uk
- Report a scam to the FCA fca.org.uk