I am sure there was a thread on here recently asking the same question and there were lots of suggestions. We have been to review The Grove. They are about 40 minutes from central London and have the most amazing childcare and facilities. They do a special package each Christmas - last year it was based around The Lion, the witch and the wardrobe, and their walled garden area, which houses their childcare, was completely decked out for the occasion. The hotel is set in a famous golf course and the spa has won Best Spa in the world last year in The Telegraph, their restaurants, food and accommodation are all amazing. I have reviewed several such establishments, but I genuinely couldn't recommend The Grove highly enough. My son says that he prefers The Grove to Disneyland Paris - when he was there he was 7 and my daughter was 5.