PigletJohn - thank you for replying I thought I would have bored everyone to death.
To answer your questions - yes we have in our house normal sized plug sockets ( so the sort you could plug a hoover / toaster into)
Also we have small ( as I believe, 5 amp ) sockets, we use them for side lamps) and they are a smaller plug with round pins - and they ( I think ) are on a different circuit so when you do one switch all the table lamps come on at one time. They look like they have very round holes similar to your examples. So in layman's terms ( which is what I am ) a normal e.g. hoover or lamp the pins on the plug on the end of the lead are squarish - these I am talking about ( pins) are round and the plug on the end of the lead is smaller. But yes round pins and all switched on from one switch on the wall
The question is, we have one of the smaller round pin sockets in the wall , but it is behind a sideboard and where I want to put a lamp is probably too far for a normal lamp flex / lead to reach. We have many extension leads in this house but they are all normal proper plug ( Ie the bigger and squarer pin type ones ) - I was just wondering if there was a 5 amp extension which would go on when you switch the light on equivalent for a 5 amp plug / socket so that when the other two lights come on - this one would as well. ( Can you tell I am trying not to get someone in to move the 5 amp socket and then have to plaster over - in fact I am not sure current building regs would lt us move that socket ) So I am just looking for what would be the equivalent of a normal extension lead but 5 amp ( I can tidy it up behind said sideboard)
Thank you @pigletjohn I did think that looked expensive - at the moment I am gibberingly grateful for just understanding what will actually work. If you had any advice , be sure I would be grateful for it. Thank you for taking the time. I suppose I am hoping there is a product rather than having to have something made up especially. This is just putting a lamp on a table in the corner of the kitchen which is just a bit too far away from the little 5 amp wall socket / plug / and hoping it can join in on switching on at the same time as those other two lamps which we can switch on at one place.
Worst case I get a normal extension lead and we have to put that lamp on manually. It would not be the end of the world. I just thought a little extension lead from the 5 amp circuit would be easier , if it were possible.
I have googled but as you can see - haven't solved it.
Thank you @pigletjohn