Matt checking belfield Tide, I would honestly say you do not want to be much after 12.00 as the "RUN" will be starting to run out and as its springs you could easily get 6 - 8kn of tide against you after about 12.30..
Enjoy Mudeford, some great cruising if you cannot get out, you have the Avon and the longer navigation of the Stour to explore..