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hugo7
@ColinTheBald
Don't waste money on the aerator, they don't achieve much.
Drainage is relatively simple, 4"perforated pipe with 4" of shingle on all sides, headed downhill into your existing drain. Be warned, you will almost certainly need a skip for the spoil and to returf the lawn. It is labour intensive!
Patios generally need 4" of concrete beneath them, with a degree or so of fall towards your (recently drained) lawn. Probably allow for a 6" deep dig as you will need a further 2" for the surface of your choice plus mortar. Estimate concrete at 1 ton per 0.5 cubic metre dug out. Allow 1.25 cubic metres of skip room per 1 metre dug as the spoil 'fluffs up' when dug.
Alternatively, give me a call if your lottery numbers come up!