£20m must be based on some assumptions, otherwise it is simply a fabrication designed to create hostility and sell newspapers.
There are 8760 hours in a year (365 x 24). Each person can do (say) 40 weeks (leaving 12 for leave, pubic holidays, training, sickness) x 8 hours per day x 5 day a week = 1600 hours per annum.
So to fill a roster to give the ex-royals one person 24x7 = 5.5 people - round up to 6 to cover gaps and recruitment and admin etc.
So some more assumption:
- each gets pay of £60k pa including pension contributions
- they share a rented house at a cost of £2k per month
- the have two vehicles assigned to them at a cost of £1k per month.
- and they each do (say) 5 long haul air routes at a cost of £1k per trip.
Adding this up gives (pa) £24k rental + £12k vehicles + £30k travel + pay £360k = £426k. Lets assume I've left a few bits out and the total cost for a 1 person 24 x 7 security cover is £500k.
Even if a team of 3 were emploed 24 x 7 it would still be £1.5m pa - not even close to £20m.
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