There are no problems with transferring funds from Egypt accounts to any other countries from an Egyptian point of view ( that I know of ) ........
However I think you need to take great care if you are not living in Egypt permanently, and are a British domicile for tax purposes.
I am not a tax expert, but the knowledge that I do have would tell me that .......
For people who are "resident" and "ordinarily resident" in the UK, if you sell a property for more than you brought it then, "officially", a Capital Gains tax is applicable, as this is a form of income.
This is whether you remit the funds to the UK OR keep them of-shore.
Using the same rules for income, any rental income from off-shore properties should be declared.
Of-course whether you decide to declare rental and Capital Gains Tax is completely up to you.
What I would say is that if you are looking to remit a lage amount of money into a UK bank account then is possible it could attract the attention of the HMRC.
Everyone's tax situation is different and therefore has different ways to reduce tax liability.
Do your own research and take advice if you are unsure.
Better to be safe than sorry : - )