If a trader with whom you are in dispute is a member of a trade association, or is regulated by a professional body, you may be able to get help and/or expert opinions from that body. Here is a list of some associations - if you can't find any relevant ones from this list, contact Trading Standards or your local CAB.

BUILDING

Federation of Master Builders
14-15 Great James Street, London. WC1N 3DP
Tel. 020 7242 7583; Fax: 020 7404 0296.

National Federation of Roofing Contractors
24 Weymouth Street, London W1G 7LX
Tel. 020 7436 0387; Fax: 020 7637 5215.

CARPETS

British Carpet Technical Centre (BCTC)
Wira House, West Park Ring Road, Leeds. LS16 6QL
Tel. 0113 259 1999; Fax: 0113 278 0306.

CARS

Retail Motor Industry Federation
9 North Street, Rugby. CV21 2AB
Tel. 08457 585350; Fax: 0171 580 6376.

Scottish Motor Trade Association (SMTA)
3 Palmerston Place, Edinburgh. EH12 5AF
Tel. 0131 225 3643; Fax: 0131 220 0446.

COMMERCIAL SERVICES

British Association of Removers (BAR)
3 Churchill Court, 58 Station Road, North Harrow, Middlesex. HA2 7SA
Tel. 020 8861 3331; Fax: 020 8861 3332.

Glass & Glazing Federation (BAR)
44-48 Borough High Street, London. SE1 1XB
Tel. 020 7403 7177; Fax: 020 7357 7458.

Hairdressing Council
12 David House, 45 High Street, South Norwood, London. SE25 6HJ
Tel. 020 8771 6205; Fax: 020 8771 3392.

Institute of Plumbing
64 Station Lane, Hornchurch, Essex. RM12 6NB
Tel. 01708 472 791; Fax: 01708 448 987.

National Association of Plumbing, Heating and Mechanical Services Contractors (NAPHMSC)
14 Ensign House, Ensign Business Centre, Westwood Way, Coventry, West Midlands. CV4 8JA
Tel. 01203 470 626; Fax: 01203 470942.

National Inspection Council for Electrical Installation Contracting (NICEIC)
Vintage House, 37 Albert Embankment, London. SE1 7UJ
Tel. 020 7564 2323; Fax: 020 7564 2370.

Textile Services Association Ltd
7 Churchill Court, 58 Station Road, North Harrow, Middlesex. HA2 7SA
Tel. 020 8863 7755; Fax: 020 8861 2115.

COMMUNICATIONS

Federation of Communication Services
(mobile phone industry)
Provident House, Burrell Row, Beckenham, Kent. BR3 1AT
Tel. 020 8249 6363; Fax: 0870 120 5927.

Office of Telecommunications (OFTEL)
(telephones)
Export House, 50 Ludgate Hill, London. EC4M 7JJ
Tel. 020 7634 8700; Fax: 020 7634 8845.

Postwatch
28-30 Grosvenor Gardens, London. SW1W 0TT
Tel. 0845 601 3265.

DOMESTIC SERVICES

Office of Electricity & Gas Marketing (OFGEM)
9 Millbank, London. SW1P 3GE
Tel. 020 7901 7000; Fax: 020 7901 7066.
Regents Court, 70 West Regent Street, Glasgow. G2 2QZ
Tel. 0141 331 2678; Fax: 0141 331 2777.

Office of Water Services (OFWAT)
Centre City Tower, 7 Hill Street, Birmingham B5 4UA
Tel. 0121 625 1300; Fax: 0121 625 1400.

ELECTRICAL GOODS

Radio, Electrical and Television Retailers' Association Ltd. (RETRA)
Retra House, St. John's terrace, 1 Ampthill Street, Bedford MK42 9EY
Tel. 01234 269 110. Fax: 01234 269 609.

FINANCE AND CREDIT

Financial Services Authority
25 The North Colonnade, Canary Wharf, London. E14 5HS
Tel. 0845 606 1234.

Building Societies Association
3 Savile Row, London W1S 3PB
Tel. 020 7437 0655; Fax: 020 7734 6416.

Companies House
Crown Way, Cardiff CF4 3UZ
Tel. (Enquiry Unit) 9870 333 3636; Fax: 029 2038 0900.

Council of Mortgage Lenders
3 Savile Row, London W1S 3PB
Tel. 020 7437 0075; Fax: 020 7434 3791.

Insolvency Service
PO Box 203, 21 Bloomsbury Street, London. WC1B 3QW
Tel. 020 7291 6895.

GENERAL

Advertising Standards Authority (ASA)
2 Torrington Place, London. WC1E 7HW
Tel. 020 7580 5555; Fax: 020 7631 3051.

HEALTH SERVICES

General Dental Council
37 Wimpole Street, London. W1M 8DQ
Tel. 020 7887 3800; Fax: 020 7224 3294.

General Optical Council
41 Harley Street, London. W1N 2DJ
Tel. 020 7580 3898; Fax: 020 7436 3525.

HOLIDAYS, TRAVEL & TRANSPORT

Association of British Travel Agents (ABTA)
68-71 Newman Street, London. W1T 3AH
Tel. 020 7637 2444; Fax: 020 7637 0713.

Association of Independent Tour Operators (AITO)
133a St Margarets Road, Twickenham, Middlesex. TW1 1RG
Tel. 020 8744 9280; Fax: 020 8744 3187.

Civil Aviation Authority (CAA)
CAA House, 45-49 Kingsway, London. WC2B 6TE
Tel. 020 7379 7311. Fax: 020 7240 1153.

Office of the Rail Regulator
1 Waterhouse Square, 138-142 Holborn, London. EC1N 2TQ
Tel. 020 7282 2000.

INSURANCE

Association of British Insurers (ABI)
51 Gresham Street, London. EC2V 7HQ
Tel. 020 7600 3333; Fax: 020 7696 8999.

LEGAL SERVICES

Law Society of England and Wales
Law Society House, 113 Chancery Lane, London. WC2A 1PL
Tel. 020 7242 1222.

Law Society of Scotland
26 Drumsheugh Gardens, Edinburgh. EH3 7YR
Tel. 0131 476 8137; Fax: 0131 225 2934.

Office for the Supervision of Solicitors (OSS)
Victoria Court, 8 Dormer Place, Leamington Spa, Warcs. CV32 5AE
Tel. (helpline) 01926 820 082 or 0845 608 6565; Fax: 01926 431435.

MAIL ORDER

The Direct Marketing Association UK Ltd.
DMA House, 70 Margaret Street, London. W1W 8SS
Tel. 020 7291 3300.

Mailing Preference Service
DMA House, 70 Margaret Street, London. W1W 8SS
Tel. 020 7291 3310.

Mail Order Protection Scheme (MOPS)
18a King Street, Maidenhead. SL6 1EF
Tel. 01628 641 930.

Mail Order Traders' Association
Drury House, 19 Water Street, Liverpool. L2 0RP
Tel. 0151 227 9456.

PROPERTY

National Association of Estate Agents
Arbon House, 21 Jury Street, Warwick. CV34 4EH
Tel. 01926 496 800; Fax: 01926 400 953.

Office of the Ombudsman for Corporate Estate Agents
Beckett House, 4 Bridge Street, Salisbury. SP1 2LX
Tel. 01722 333 306; Fax: 01722 332 296.

Royal Institute of British Architects (RIBA)
Client's Advisory Service, 66 Portland Place, London. W1N 4AD
Tel. 020 7580 5533; Fax: 020 7255 1541.

Royal Institution of Chartered Surveyors
12 Great George Street, London. SW1P 3AD
Tel. 020 7222 7000; Fax: 020 7222 9430.