A pic from lower down

I rather thought those two establishments were elsewhere in Market Jew Street, further down; I will check and get back again.

The Victoria Inn otherwise known as The hole in the wall was below where the YMCA once stood

The YMCA was where SWEB is, I surveyed it before SWEB took it over. I thought the hole in the wall was further down where Smiths is.

yep it was one of those buildings with the granite frontage just above the dentist

In 1939 Jack Pengelley writes (so you will have to make the updates to the 1950s)
The marker is Nr 99 = Holman s Cycle Shop and then Cornish Gifts; Below Nr 99 was a public house, named The Hole in the Wall, with a large door which led to Miss Pool s House and Gardens; Below that was a large double fronted Granite House, which was a Dentists - though re-built later twice. Below that was Trevails, then Penzance gas Showrooms (Oliver Caldwell s design); then Gas lane .
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Above Nr 99 was the opening to Holman s Holman s motor cycle shop, then Holman s garage and petrol sales; Nr 102 was Boase the fruiter; 103 Labour Exchange, Hocking Stores; Nr 104 was YMCA with two shops below it (Holiday Penzance and Martin and Edwards hairdessers); then 105 Woolworths; above Woolworths was 106 Prince of Wales Pub, with stables at the rear. Then 107 Radbourne tobacco; 108 Avis Florist; 109/110 Bridger books; 111 Davey Wine and Spirit; Jennings Street.
I need to check this with the OS map, I have to say.

Hey there Treeve going down across Gas lane ther used to be Hendy a fish merchant I believe they later moved across the street
to a shop on the Terrace - this goes back many years

It was indeed, up the street was Gas Court entrance and Trudgeons. Down the street was Army Navy Stores Mr Stokes, then the Congregational Church.

there was also a little sweeet shop there had to go up about three steps the door had a bell on one of those springs, I remember the pavement there was not much more than about two feet wide- that would be back in the 1930 s

Trudgeons was the one with the steps up to the door apparently