Leaving job after only a few months

[Crippled Potato]

So, I’ve been at this current job for about 2 months now because it was in a convenient location for me and cut down on the commute I was doing for the previous place. However, in that time I've found that I've had very little training and interaction with other people. Overall I've started to dislike it very quickly as my day just consists of me at my desk for most of the day working in solitude.

I ended up messaging one of my colleagues (We'll call him Brian) and found that a couple of people and Brian are leaving for various reasons so they are looking for new employees. I left this place 4 months ago on good terms.
I pondered about it over the weekend and sent a message to my old team leader and he seems positive for me to come back aboard. I'll be moving house to cut down the commute if it all goes to plan.

Now here’s the tricky part. How do I go about handing in my notice at my current job? It’s a smaller company and my notice period is only a week because I'm still on probation. But I can’t imagine it’s going to be a pleasant conversation as it feels like I'll be performing a bit of betrayal when I tell them I'll be going back to my old job. Will I just have to just expect facing a bit of a **** sandwich?

 

[Crippled Potato]

Cheers for the responses. Everything looks positive for the return and I’m expecting the offer to arrive in the post either today or tomorrow. So I’ll be probably putting the notice in on Monday.

I’m committed to doing it, but this is going to catch them by surprise and it’s pretty bad timing that someone else in the office is leaving at the same time. Any tips on how to approach and deliver it?

 

[Crippled Potato]

Follow up update:

Handed in the notice which did catch them by surprise but I did my weeks worth of notice and then finished up. Was completely frank and honest with them during the interview why i didn’t enjoy the role and they took it rather well. Started the new/old job today, happy potato.