AA
What you did seems good to me. Thames Radar is not a LARS unit, and as such we have had some squawks taken from us accordingly.
I would recommend listening in to the freq and seeing how busy we are. I can only offer a Limited RIS at the most, as our radar is poor at low levels (see above on microlights!!)
LCY is getting very busy nowadays - up to 31 inbounds per hour to LCY alone - so add the outbounds, and Biggin IFR movements, the Battersea Helis etc and you can see that it will sometimes be impossible.
Also, I cannot give you any real radar service within the vicinity of LAM due to Stapleford of course. As for out to the west, Thames really only goes as far as the North-South line through Battersea Heliport. THEN remember that Southend ARE a LARS unit so we are unlikely to give you much East of LAM!
Apart from all that, we will help IF we can!!