As Andy mentioned, but I had forgotten, there was the issue of Purchase Tax.
5% doesn't seem much nowadays and it was non-cumulative though replaced by VAT later on in 1973 at a higher rate. I think that some times it was included in the cost, sometimes not and I can't remember what the rules were.
Compared 47 shillings, for a number 4 plane listed on the same page it was an expensive piece of kit. I can recall a Wolfe electric drill coming in at around £4 about that time and it only had a 1/4 inch chuck!
As a lad in school, the woodwork teacher had an old sit-up-and-beg desk which he hid behind. On the wall behind all that was a glass case containing the display of special tools which only came out on high days and holidays..... a plough plane (I don't think that it was a 45/405, probably a No: 44), mortise gauges, some posh chisels etc. all nicely polished.
We think that 'old money' is quaint now...... but it had its charms.
When it went west in 1971 we also lost a lot of old terminology. We could buy a Mars bar for a tanner, an old Bob would get you into the pictures, one-'an-a-tanner would buy a couple of pints, two-'n-six or half a dollar...... In the fifty years since we still say 'pence' or 'P'.
On the subject of Multi-planes, although Clifton offered one (wasn't it over 400 quid???) I prefer the 405 to a Stanley 45. It's a better build in my opinion. In the same way that a Record 050 is better-made than the Stanley 50.
I'll get my head down now!