I have refused your application for a visit visa because I am not satisfied that you meet the requirements of paragraph(s) V4.2 Appendix V: Immigration Rules for Visitors because:
You have stated that you wish to visit the UK for a period of 15 days accompanying your employer. I note you employed as a nanny and that the child you care for is accompanying you for the duration of the trip.
I am not satisfied that you will not undertake any prohibited activities set out in V 4.5.
You have provided a bank letter that states you have a bank balance of 1062528.49 RUR (£13,244.90 at the Oanda.com exchange rate 03/04/2018) on 19/03/2018 in account number ending xxxx1689.The documents you have provided do not demonstrate the source of these funds. I am therefore not satisfied that these funds are genuinely available to you.
Considering the above I am not satisfied that you are genuinely seeking entry as a visitor and will leave the UK at the end of your visit. I am also not satisfied that you are genuinely seeking entry for a purpose permitted by the visitor routes and you will not undertake any of the prohibited activities set out in V4.5 – V4.10. V4.2 (a) (c) and (d).
Any future UK visa applications you make will be considered on their individual merits, however you are likely to be refused unless the circumstances of your application change. In relation to this decision there is no right of appeal or right to administrative review.