For those that are still searching for something to let them use the ever increasing range of Type 2 charging posts, there IS an off the shelf solution, but it comes at a price. Sold by Energy Solutions in the UK, the lead - which uses a green cable - features a standard Type 2 plug, to an MK-type enclosed weatherproof 13a socket. Maximum charge is limited to 10a, which is spot on for the Twizy.
The cost (as a one-off) is £244.00, plus VAT and carriage, however I expect quantity discounts will be possible if there is demand from the forum. Whilst this seems a high price to pay - and indeed it is, if you factor in the material cost of the sockets you are already over £100 before you get to the electronics to fool the post into providing a supply to your Twizy.