Hi I’ve sent you a messageThere are some new developments in the biomethane market that could make this viable. The recent extension of the RHI scheme to January 2021 also helps.
How far down the development path are you? If you've got planning, grid injection etc already sorted then that's a big help. If you're still at he blank sheet of paper stage it will be challenging to meet the Jan 2021 deadline, but there are other gas markets offering similar value to the RHI Tier 1 which don't come with the same time constraints.
If you want to drop me a PM I can give you my contact details and we can explore possible ways forward.