My derm recommended Sunsense Daily Face SPF50+ Sunscreen to me because it's water based, not oil based. To be honest, it's greasier than I was expecting but it's not as oily as some others I've tried. Here in the UK, I'm not sure if you can get it in Boots but it's available from John Lewis. I brought it on Amazon because it was a lot cheaper.

If I was you I would go into boots and ask one of the pharmacists in there, they are often really helpful. Essentially, you need to look for something water based because this should not block your pores and make you break out

I just hope that we get a summer good enough to need sun cream this year!