Remote access (suse) and fixed IP (needed??)

I do not yet use remote access to my home system (adsl router and lan using local fixed IPs on lan PCs, all suse linux).
However, I would be grateful for comments about whether I can arrange remote access to a chosen PC on the home lan via fairly normal internet techniques, given strong passwords or procedures, using an ISP without a fixed IP for my broadband connection.

The reason is - a local provider has the advantage of its equipment in the UK BT local exchange, and can offer very low rates for domestic packages which would probably suit me. But I notice it is non-fixed IP.

I collect mail via pop3 and do not intend to run any web or mail servers from the home machine/s.
However, (and I am totally ignorant about this), it is just possible in the future that I would like to try setting up remote access to the home machine/s from - say- a relatives house.

Is a fixed IP from the isp essential for this, or are there some options or possibilities?

tia
--
ac
.

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