GNSS base station needed in London for research

I’m currently looking someone in East London to host a base station and cast their GNSS data to an NTRIP server. I am writing up a Caster in golang which is opensource to produce VBS similar to Smartnet and VRS Now.

I have covered West London and South London. I just need a 3rd base station streaming to the NTRIP server. This will allow for quick time to fix as we should be able to do majority of the corrections for ionospheric and tropospheric delays.
My main problem in my research is testing the calculations for the VRS.