Wow, its great to see that you have so much IPA!! But the price? 10L of 99.7% IPA before the pandemic was available for £30 delivered…
DPM is currently available in the UK for around £35 - £40 for 5L
Are you sure you can ship it via Royal Mail? You mention 1st class recorded - which is a Royal mail service) - Its on their list of prohibited items and they will only ship 50ml at a time.
Out of interest what is the RS part number?