How long is a piece of string (silly pricing question)

[themarino]

Afternoon all,
I realise that this is very likely a silly question but I'm only looking for a very pricing guide from a professional.
I moved recently and as a result no longer have a garage. I'm building a workshop which I eventually want to get connected to proper mains electricity rather than making do with an extension lead.
The CU is currently full - no spare connections available.

Here's the daft bit - if, assuming that everything else is in order and nothing else needs doing:

How much work (time and ££) would it take to split the tails, add in a Henley and an isolator switch? (Can't do this myself obviously because it would involve disturbing the DNO fuse)

I need this work done so that at some point the SWA that will come into the house from the CU in the workshop can be connected.

As I say, I'm only looking for a very rough ballpark estimate - I know it's very often the case that other things end up needing replacement but I just need to know how to price up what this project will cost me. Are we looking at £50? £100? £500?
Thanks in advance for any help.
Cheers

 

[elsparko]

i see you, and raise.

 

[themarino]

Time for a pan galactic gargle blaster!
TFIF, it's been a crap week

 

[themarino]

Upon re-reading up on Part P I see that the regulations are far stricter than I'd thought and I didn't realise that what I was planning isn't allowed any more (I've lived overseas for 20 years).
I think I'll farm this job out to make sure I stay legal.
Thanks for your help guys

 

[elsparko]

Upon re-reading up on Part P I see that the regulations are far stricter than I'd thought and I didn't realise that what I was planning isn't allowed any more (I've lived overseas for 20 years).
I think I'll farm this job out to make sure I stay legal.
Thanks for your help guys