Gap between window frame and brickwork.

The usual rubbish job of window fitting, the gap is about 50mm wide. It was covered with plastic facing, siliconed to the wallpaper.
Should I fill the gap with expanding foam and plaster over?.
Any suggestions welcome.
There actually seems to be sod all holding the window frame in, I'll have to have a proper inspection tomorrow.

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I would totally reject that, have you already paid?

Rip those horrible plastic liners off, line it with 4 x 2 or whatever size you need, plasterboard and skim.

We recently bought the house, the windows were done about ten years ago.
It was a deal done by Everest for about a dozen remaining tenanted houses owned by a big local employer, they're now being sold off as the factory closed down.
All the maintenance work on these houses over the years has been utter garbage, we knew this before we bought.
We only paid £27,000 for a 3 bed end-terrace as we got a huge discount from working in another part of the firms operations for 20 years. The last one like this to sell in the village went for £145,000.
I've already put in about £16,000 of labour and only £4,000 of materials so I'm happy with that!.
Thank the lord I found DIYnot though, this forum has been absolutely invaluable and I can't give enough thanks to the guys who give so freely of their knowledge.
Forest Grump - by liners do you mean the ingoes at top and sides ?. They're just siliconed on I think.

Yes, looks much neater if you take those off and plaster.

Ah yes, you need the backing of a large National to get quality like that! If it's 10 years old already, I'd be tempted to rip it out completely & replace it with a window that actually fits the opening! If you do replace, make sure you get a certificate of compliance from your local BC or use a FENSA installer; IMO that one would never comply with current installation regs!

Thanks again for all the input, always grateful for advice. It gives lots of food for thought.

could you not just put a sand/cement mix in to fill in the gap around the window and the brick wall. jsut chuck it in and neaten it off.
i did that at my house when i bought it, similar to yours. or you could fill the gaps in with foam then skim over the foam once you cut it back.