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Something like the Gripit don't need much space behind the plasterboard to expand.
http://uk.rs-online.com/web/p/products/8697826/?grossPrice=Y&cm_mmc=UK-PLA-_-google-_-PLA_UK_EN_Fasteners_And_Fixings-_-Screws_And_Bolts&mkwid=stOChiv0N_dc|pcrid|88057041963|pkw||pmt||prd|8697826&gclid=CjwKEAiAqJjDBRCG5KK6hq_juDwSJABRm03hlMmgAX49BP5NiZtNuWeQytifd47n8dthxxKlWeICphoCMLXw_wcBI'm sure someone will say drilling in to the brick is best, although I'm not sure any kind of floating shelf will be able to support a number of records.
On the topic of plasterboard fixings, I have some shelves to put up (which will be loaded with books/records). The wall is double thickness plasterboard then a small void (I think it's 10-20mm deep but not totally sure) then Victorian brick.
I've tried to use spring toggles before but the gap behind the board wasn't big enough for the wings to clear and spread. Will self tapping plasterboard fixings be ok for heavy shelves? Or would I be better to drill in to the brick and use long screws and a rawl plug going in to the brick?