I can't believe a laptop needs 11.5amps - as you say this is cooker hob territory.
My recently purchased Acer has a 19 volt output at 2.37 amps. This equates to an input of 0.2 amps at 240 volts.
It is plausible there is a shortage of chargers at the moment in common with many other electrical items but you are being royally ripped off unless it is a very special laptop.
Key issue is to get an adaptor with the right size connector and the correct voltage. Within reason the laptop will cope with a variation in amps by either limiting the current or charging more slowly.
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