Below are a number of files (or there will be) which can be downloaded and used elsewhere for design work. No payment is expected, although a contribution to the NSPCC would be appreciated if you find them useful. As they are free for your use, it is expected that a thorough checking is done to confirm they are stable and useful for integration into other calculations. If there are any faults, please email us on the contact us page, with the fault found.

Any additions you may wish to add are also welcomed, providing they are fully referenced for our own checking purposes, together with copies and/or links of the source material.

Note, the calculations are simplistic in nature for a number of reasons

• They are easier to check
• Far easier to fault find
• They are stable
• Can be copy and pasted elsewhere without too many problems.