It is def hard work with them 2. but its getting so much easier. i also work in london and plan to work from home half of the time and in the office half. that is my biggest worry. but the eldest starts preschool in jan (aged 2) and i think having this time with new baby and ds2 will work out well. and then in the afternoon we can all go out etc. im really excited just thinking about what it would be like!
If you got preg next mnth u could have 2yrs5mnths, 18mnths, and a newborn. It is possible, but might be hard work. When my dts were born dd and ds were 4 and 2. It hasn't been too bad as they could walk without needing a buggy, were toilet trained, can feed/dress themselves etc.
You've already managed a young toddler and a baby together, so it would e the same situation over again, you older one should be pretty independant. If you want three children, personally I owuld go for it, rather than waiting to start again. I'm glad mine are pretty close together, they will grow up together.