Assign a charge to children

My client, when he divorced in 2001, entered into a charge to secure monies owed to him by his ex partner. The legal charge has been protected by entering a unilateral notice against the Charges Register of the Property and notice refers to an equitable charge dated 23 July 2001. I have no information as to why it was protected by a Notice of a equitable charge rather then actual registration of the legal charge.

David - please see our PG 19 section 2.8.2 for guidance -  Practice guide 19: notices, restrictions and the protection of third-party interests in the register - GOV.UK (www.gov.uk)

Thank you so much for your very prompt reply....could l ask does the same apply if it was a straightforward Registration of  a Legal Charge

David - no a registered legal charge can be transferred in the same way as a property is also transferred.
Your original post refers to a mix of scenarios inc a unilateral notice and an equitable charge. The latter is a noted charge or an Agreed Notice and different to a Unilateral Notice.
Often such 'charges' can't be registered as a legal charge as there's already a first legal charge on the title and the lender, usually the mortgage lender, won;t consent to a second charge being registered - just adding that for info as you seemed unsure as to why the charge you have was registered as it was.

Your advice is very much appreciated thank you...

Thank you...just so l am totally clear about things, my wife following divorce so years ago had the house transfered to her with Title Absolute and l have a registered charge to secure moneys owed. l now wish to transfer that registered charge to my children by way of a gift and remove myself from the Charge. Could you advice me which forms to submit to to register this change.

David - if you are transferring the legal charge then you'll need forms AP1, TR4 and ID1/ID3 as appropriate
See the online guidance re transferring a registered title but replace TR1 with TR4. 
On all such matters I would always recommend seeking legal advice/assistance as well to understand the legal impact and more as appropriate