You have so many good options from the UK. I would recommend one of the following...
Sky Poker - The returns here are not the best, but the games are pretty much the softest you will find anywhere online, no HUDs. £10 free in tokens + up to 20% rakeback through VIP program + 200% Bonus up to £500 clearing at 24%.
Unibet - Along the same lines as Sky, ridiculously soft games. This site is very much aimed at recreational players. You can change your alias up to 3 times per day and again no HUDs allowed which makes the games great, they have a fun software too. Up to 60% rakeback through VIP program + £10 free + €200 New Player Bonus clearing at 24% +
$55,000 PokerVIP Top 500 Rake Race (Average of 15%)
Party Poker - I have played a lot here and I can highly recommend for the stakes you are playing. A decent amount of traffic here and the games are definitely rated very soft and for me, the software is the second best available next to Stars, I love it personally and will always go back at some point. Up to 30% rakeback though VIP program (Just $1k in rake per month for 30%) + 100% up to $500 Deposit Bonus clearing at 20% +
$55,000 PokerVIP Top 500 Rake Race (Average of 15%)
If you are after something with a bit higher returns. Then I would recommend Microgaming yes. As I said above, nice soft games, decent traffic and software and obviously very nice returns. Saw you mention in your PM that you have a Betvictor account already, but we do have an identical option on Betway, same network, player pool, software etc.
Betway - 30% rakeback through top VIP level upgrade for life. You can exchange points at anytime + 200% up to $1000 1st Deposit Bonus clearing at 20% +
$55,000 PokerVIP Top 500 Rake Race (Average of 15%)
Hope this helps, let me know if you have any questions and again if you sign up, please remember to clear cookies on your web browser first and let me know your details for the new account so I can get it set up on our end.
Skype - keri.pokervip
Email - keri@pokervip.com