South Office

We first opened our doors in Rickmansworth in 1997.  Dermot Costello co-founded the practice and still heads up the office today. We wished to establish a practice outside London and chose Rickmansworth given its convenient location to London and Watford, its thriving business community and relatively affluent surroundings.  Dermot is a Chartered Tax Adviser and is a director of Cox Costello South Limited alongside John Phillips who is a Chartered Accountant. 

We have a team of approximately 20 professionals providing accounting, tax, bookkeeping, and payroll services to a wide range of clients throughout South East England and as far away as Singapore, Australia, Canada and Europe. 

Our busy Business Services Department is run by Lorraine Earley, a Chartered Certified Accountant who first joined Cox Costello & Horne in 2002 as a trainee. Our Tax Department is run by Martha McGarry who has previously managed a large tax departments in a medium-sized regional practice. And our Assurance and Accounts Department is headed up by Khurram Naseem, a Chartered Accountant who recently joined us from PWC.

Our Rickmansworth offices also houses our payroll subsidiary, CCH Payroll Limited, which provides innovative, cost effective and efficient payroll services through the Cox Costello & Horne group.

Located conveniently on the Metropolitan/BR line into London and just inside the M25, the office is well placed to service the needs of our clients. We are just a couple of miles from Watford and are handily situated in Rickmansworth High Street behind the library and Basing House, the former home of Willian Penn, the founder of Pennsylvania.

If you would like to drop in for a chat about how we can help, whether with your business or your personal tax affairs, please call 01923 771977.

Cox Costello South Limited
Basing House
46 High Street
01923 771977

A member of the Institute of Chartered Accountants in England and Wales Practice Assurance Scheme under reference C004947411  

Registered in England No. 10472557   
VAT registration no. GB 258 0372 03 

Registered as a firm of Chartered Tax Advisers by the Chartered Institute of Taxation

Our professional indemnity insurance cover is provided by Travelers Insurance Company Limited, 61-63 London Road, Redhill, Surrey RH1 1NA, policy number UC SCR 3993735. The territorial limitations of this policy are work undertaken and in relation to the UK, Ireland, Channel Islands and the Isle of Man. 

Cox Costello & Horne is registered with the Information Commissioner's Office under reference ZA246622.