We have recently got our 1949 IDP valid for Ireland Malta Spain and Cyprus as we will be travelling back to UK post B. We are travelling via Santander and will only be in Spain. But if we had chosen to go through France the Post Office, or rather Canterbury PO (only limited POs can issue them, although the PO site advertises they are available from all they are not!) had no info/knowledge on the 1968 IDP it only showed 1926 and 1949 on their forms. Looking on the Internet, the 1968 needed for the rest of EU will not be issued in the UK until the begining of Feb. What happens if you are already abroad?

If you have a photocard licence then as it conforms to the EU model that of itself pretty much negates any need for an IDP !

The OP was asking about the situation post Brexit. With a No Deal, until reciprocal arrangements are agreed, the UK licence could be rejected unless accompanied by a IDP.

An IDP is only a certified translation of your driving licence. Certified by a stamp for a fee by the free employee youth trainee at the AA or RAC portacabin at the motorway services car park.

Sorry Fred, I suppose the latter.

From Feb 2019 RAC and AA can no longer issue them but thanks for your useful information!

Even after B-day there is the transition period until 2020. Even with a no deal B

There’s no transition period without a withdrawal agreement. We just become a third country on 29 March.

An IDP will be not required by British driving licence holders in a ‘no deal’ scenario as British licences meet the requirements set out in the 1968 convention.

where do you get that from?

Not true!

I got an international licence at the beginning of October cost £6.
6 months will be wasted but I will avoid any delays or crush should it become necessary at the end of March.

The 1968 IDP is available from Feb and according to gov website is needed.
"1968 Vienna Convention on Road Traffic The 1968 Vienna Convention is a UN international treaty designed to facilitate international road traffic and increase road safety by establishing uniform traffic rules. It has been signed and ratified by 75 countries. The UK signed the Convention in 1968, but is yet to ratify it. Ratification will guarantee continued access for UKdriving licence holders to the EU after we depart, provided the driver holds a valid International Driving Permit (IDP) document."

You can get IDP at UK post office if in the UK cost is £5.50 and you can delay the start date for up to 3 months.
As for transition period after 29 March any transition depends upon a deal being done, no deal = No Transition period that's how it currently stands but who knows what could happen?