Northern Rock - Out of control lending and spiralling debt and the inevitable boom and bust in the housing market are a result of Thatcher's financial deregulation in the 80s.
Dodgy Party Funding and DataGate - Thatcher's autocratic style and disregard for democracy 'won' elections and forced Labour to follow suit. Thatcher abolished local government and she put undemocratic Quangos in its place. We still haven't recovered from this top-down unaccountable managerial inefficiency.
England being crap at sport and our children fat and unhappy - Burgers and chips on school menus, legalitus forcing after school activities to cease and building for the car - this all reduced children's opportunity to play and all stem from the Thatcher era. Not to mention the tripling of child poverty as inequality spiralled (VAT doubled & Council Tax was introduced to hit poor, top rate income tax cut for the rich, public services trashed).
Crap Public Transport - Outside London, deregulated buses all turn up within 5 minutes of each other and there are none for an hour afterwards - Thatcher is to blame.
Muslim terrorism - Thatcher's dodgy deals with Saudi Wahabis helped prop up their dictatorship and madrassas both there and Pakistan - the spectre of Thatcher hangs over the 7/7 bombings.
Few top level English footballers - see 'crap at sport' above, but also Thatcher sucked Murdoch's cock and overode competition legislation to let him do what he wanted. The inequality in English footy is the result.
Lack of renewables - Despite the best R&D and biggest wind resources in Europe, Thatcher starved our fledgling wind power industry of funds. Denmark didn't starve theirs, now they lead the world.
Finally - insert any current problem - Thatcher is undoubtedly at the root of it. See also this post.