the trouble with getting your seeds going too early is, you will either have poor germination rates as the average day and night temperature is too low, but even if you germinate, you are likely to have high incidence of damping off seedlings, or very leggy weak ones. BUT if you have enough seeds to experiment with, then give it a go!
Re Slough - I know some people are very happy to be associated with it, so I won't say anything detrimental about it., cos I don't want to hurt anyone's feelings. Where are you then?