Dear shysinaiI am not a lawyer but I can give you some sound points that you can follow up with a Uk and Egyptian Lawyer.
1) As a British citizen you cannot get properly married in a mosque. The only place you can be legally married is at the ministry of justice in Cairo. If you then wish to follow this up with a ceremony at a mosque that is up to you but most Egyptians do not get married in the mosque.
2)As you have been married before you will need to get your divorce certificate legalised in the UK which means it must have been signed by a circuit judge first before taking it to London to the the Legalisation offfice. Full info is on the British Embassy web site regarding this.
3) If you decide to get legally married then your marriage will be recognised in the UK and could then be subject to UK property laws. You would be wise to make a UK prenuptial agreement that is then translated into Arabic and forms part of your marriage contract. You should seek advice of a UK lawyer as a prenupial agreement is still a grey area in UK law although most courts respect the wishes of the parties.
4) You would not have problems in Egypt regarding your assest as under Egyptian law the husband does not get any rights to his wifes assets that she has before marriage. You should double check this point with an Egyptian lawyer.
5) You could go along with what your husband wants because many sheikhs/ mazooons seem to be ignorant of the law....but you will not then be legally married and your assets will still be safe!!!
Hope this helps
Penny