Dora, is looking for part time childcare in Kingston upon thames

I am a mother of two boys 7 and 4. My kids will arrive in Kingston on the 20th of June. I am looking for a childminder for them initially for 2-3 days per week and for 7 hours per day for 1 month (until the 20th of July). I am a maths teacher and I work as a supply teacher so it is difficult for me to have a stable weekly schedule. My kids don't know english (we are greeks) but I want them to be around other children in order to familiarise with the language before they attend school on September. They are very polite, shy and well behaved.