HI @Yazzi3 the UK-based finance options that AniSL mentioned is Access Fertility. They have arrangements with quite a lot of UK clinics. They do 2 different types of package - One is that you pay a fixed cost for 2 or 3 cycles and they give you a proportion of the money back (up to 100% depending on what package you choose) if you don't end up having a baby by the end. The other is that you pay for 2 or 3 cycles at a fixed cost which would be cheaper than paying the normal clinic costs. You can also pay in monthly installments rather than all at once.
We went for the second option (a 2 cycle 'multi-cycle' package - no money back if it doesn't work out, but is cheaper than the refund package) - it covers 2 rounds of egg collections, all freezing costs, an unlimited number of frozen transfers, and all scans during the treatment, and also includes a couple of 'add-ons' (embryo glue and time-lapse). It doesn't cover the initial appointment with your clinic, drugs, or the blood tests you have to have before starting treatment (and it wouldn't cover PGS). The exact cost depends on your age, and whether you are going to have IVF or ICSI. 'Success' is defined as being a live birth, not just a positive pregnancy test, so if you were to get pregnant and then miscarry you would still be entitled to the rest of your treatment.
The main reason we decided to do it this way was that I wanted to commit to a certain amount of money and not have to think about it, rather than constantly be getting invoices and feeling under pressure of 'shall we have one more go?' 'what if we try this expensive add on this time?'. Also we worked out that while we would end up losing money if it worked the very first time, as soon as we started having to pay even for just 1 frozen transfer (let alone potentially more than one of those and/or a second fresh cycle) we would start to break even on what we would have spent.
As it turns out, I've had a bfp on my first fresh cycle, and so it turns out that this pregnancy is viable, then it would have been cheaper just to pay the normal fee rather than the package. But even if that happens I'll be so relieved to have been so lucky that I won't regret it!